2. Cyberoam Anti Spam Implementation Guide
IMPORTANT NOTICE
Elitecore has supplied this Information believing it to be accurate and reliable at the time of printing, but is presented without
warranty of any kind, expressed or implied. Users must take full responsibility for their application of any products. Elitecore
assumes no responsibility for any errors that may appear in this document. Elitecore reserves the right, without notice to make
changes in product design or specifications. Information is subject to change without notice.
USER’S LICENSE
The Appliance described in this document is furnished under the terms of Elitecore’s End User license agreement. Please
read these terms and conditions carefully before using the Appliance. By using this Appliance, you agree to be bound by the
terms and conditions of this license. If you do not agree with the terms of this license, promptly return the unused Appliance and
manual (with proof of payment) to the place of purchase for a full refund.
LIMITED WARRANTY
Software: Elitecore warrants for a period of ninety (90) days from the date of shipment from Elitecore: (1) the media on which
the Software is furnished will be free of defects in materials and workmanship under normal use; and (2) the Software
substantially conforms to its published specifications except for the foregoing, the software is provided AS IS. This limited
warranty extends only to the customer as the original licenses. Customers exclusive remedy and the entire liability of Elitecore
and its suppliers under this warranty will be, at Elitecore or its service center’s option, repair, replacement, or refund of the
software if reported (or, upon, request, returned) to the party supplying the software to the customer. In no event does Elitecore
warrant that the Software is error free, or that the customer will be able to operate the software without problems or
interruptions. Elitecore hereby declares that the anti virus and anti spam modules are powered by Kaspersky Labs and by
Commtouch respectively and the performance thereof is under warranty provided by Kaspersky Labs and by Commtouch. It is
specified that Kaspersky Lab does not warrant that the Software identifies all known viruses, nor that the Software will not
occasionally erroneously report a virus in a title not infected by that virus.
Hardware: Elitecore warrants that the Hardware portion of the Elitecore Products excluding power supplies, fans and electrical
components will be free from material defects in workmanship and materials for a period of One (1) year. Elitecore's sole
obligation shall be to repair or replace the defective Hardware at no charge to the original owner. The replacement Hardware
need not be new or of an identical make, model or part; Elitecore may, in its discretion, replace the defective Hardware (or any
part thereof) with any reconditioned product that Elitecore reasonably determines is substantially equivalent (or superior) in all
material respects to the defective Hardware.
DISCLAIMER OF WARRANTY
Except as specified in this warranty, all expressed or implied conditions, representations, and warranties including, without
limitation, any implied warranty or merchantability, fitness for a particular purpose, non-infringement or arising from a course of
dealing, usage, or trade practice, and hereby excluded to the extent allowed by applicable law.
In no event will Elitecore or its supplier be liable for any lost revenue, profit, or data, or for special, indirect, consequential,
incidental, or punitive damages however caused and regardless of the theory of liability arising out of the use of or inability to
use the product even if Elitecore or its suppliers have been advised of the possibility of such damages. In the event shall
Elitecore’s or its supplier’s liability to the customer, whether in contract, tort (including negligence) or otherwise, exceed the
price paid by the customer. The foregoing limitations shall apply even if the above stated warranty fails of its essential purpose.
In no event shall Elitecore or its supplier be liable for any indirect, special, consequential, or incidental damages, including,
without limitation, lost profits or loss or damage to data arising out of the use or inability to use this manual, even if Elitecore or
its suppliers have been advised of the possibility of such damages.
RESTRICTED RIGHTS
Copyright 1999-2009 Elitecore Technologies Ltd. All rights reserved. Cyberoam, Cyberoam logo are trademark of Elitecore
Technologies Ltd.
CORPORATE HEADQUARTERS
Elitecore Technologies Ltd.
904 Silicon Tower,
Off. C.G. Road,
Ahmedabad – 380015, INDIA
Phone: +91-79-66065606
Fax: +91-79-26407640
Web site: www.elitecore.com , www.cyberoam.com
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4. Cyberoam Anti Spam Implementation Guide
Technical Support
You may direct all questions, comments, or requests concerning the software you purchased, your
registration status, or similar issues to Customer care/service department at the following address:
Corporate Office
eLitecore Technologies Ltd.
904, Silicon Tower
Off C.G. Road
Ahmedabad 380015
Gujarat, India.
Phone: +91-79-66065606
Fax: +91-79-26407640
Web site: www.elitecore.com
Cyberoam contact:
Technical support (Corporate Office): +91-79-26400707
Email: support@cyberoam.com
Web site: www.cyberoam.com
Visit www.cyberoam.com for the regional and latest contact information.
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5. Cyberoam Anti Spam Implementation Guide
Typographic Conventions
Material in this manual is presented in text, screen displays, or command-line notation.
Item Convention Example
Server Machine where Cyberoam Software - Server component is
installed
Client Machine where Cyberoam Software - Client component is
installed
User The end user
Username Username uniquely identifies the user of the system
Part titles Bold and
Report
shaded font
typefaces
Topic titles Shaded font
Introduction
typefaces
Subtitles Bold & Black
typefaces Notation conventions
Navigation link Bold typeface Group Management → Groups → Create
it means, to open the required page click on Group
management then on Groups and finally click Create tab
Name of a Lowercase Enter policy name, replace policy name with the specific
particular italic type name of a policy
parameter / Or
field / command Click Name to select where Name denotes command button
button text text which is to be clicked
Cross Hyperlink in refer to Customizing User database Clicking on the link will
references different color open the particular topic
Notes & points Bold typeface Note
to remember between the
black borders
Prerequisites Bold typefaces Prerequisite
between the Prerequisite details
black borders
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6. Cyberoam Anti Spam Implementation Guide
Overview
Welcome to Cyberoam’s – Anti Spam User guide.
Cyberoam is an Identity-based UTM Appliance. Cyberoam’s solution is purpose-built to meet the
security needs of corporates, government organizations, and educational institutions.
Cyberoam’s perfect blend of best-of-breed solutions includes User based Firewall, Content
filtering, Anti Virus, Anti Spam, Intrusion Prevention System (IPS), and VPN.
Cyberoam provides increased LAN security by providing separate port for connecting to the
publicly accessible servers like Web server, Mail server, FTP server etc. hosted in DMZ which are
visible the external world and still have firewall protection.
Cyberoam Anti Spam as a part of unified solution along with Anti Virus and IPS (Intrusion
Prevention System) provides real time virus and spam scanning.
Anti Spam module is an add-on module which needs to be subscribed before use.
Spam
Spam refers to electronic junk mail or junk newsgroup postings. Some people define spam even
more generally as any unsolicited e-mail.
Spamming is to indiscriminately send unsolicited, unwanted, irrelevant, or inappropriate messages,
especially commercial advertising in mass quantities. In other words, it is an inappropriate attempt
to use a mailing list, or other networked communications facility as a broadcast medium by
sending the same message to a large number of people who did not ask for it.
In addition to being a nuisance, it also eats up a lot of network bandwidth. Because the Internet is
a public network, little can be done to prevent spam, just as it is impossible to prevent junk mail.
However, the use of software filters in e-mail programs can be used to remove most spam sent
through e-mail to certain extent.
With the number of computer users growing and the exchange of information via the Internet and
email increases in volume, spamming has become an almost everyday occurrence. Apart from
network bandwidth, it also affects the employees productive as deletion of such mails is a huge
task. Anti spam protection is therefore a priority for anyone who uses a computer.
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7. Cyberoam Anti Spam Implementation Guide
Cyberoam Gateway Anti Spam
Cyberoam Anti Spam as a part of unified solution along with Anti Virus and IPS (Intrusion
Prevention System), provides real time virus scanning that protects all network nodes –
workstations, files servers, mail system from known and unknown attacks by worms and viruses,
Trojans, spyware, adware, spam, hackers and all other cyber threats.
Cyberoam detects spam mails based on:
• RBL (Realtime Blackhole List) for which Gateway Anti Spam module subscription is not
required. But, by implementing only the RBL-based filtering might increase number of false-
positives. It can be implemented by enabling “Sender IP address blacklisted by RBL” from
Spam policy.
• Mass distribution pattern using RPD (Recurrent Pattern Detection) technology for which
Gateway Anti Spam module subscription is required. RPD technology responsible for
proactively probing the Internet to gather information about massive spam outbreaks from the
time they are launched. This technology is used to identify recurrent patterns that characterize
massive spam outbreaks.
Cyberoam Gateway Anti Spam provides you with powerful tools for scanning and detecting spam
in the e-mail traffic. Cyberoam Gateway Anti Spam inspects all incoming emails - SMTP, POP3
and IMAP traffic - before the messages are delivered to the receiver's mail box. If spam is
detected, depending on the policy and rules set, emails are processed and delivered to the
recipient unaltered, reject and generate a notification on the message rejection, add or change
subject or change the receiver.
Cyberoam Gateway Anti Spam is fully compatible with all the mail systems and therefore can be
easily integrated into the existing network.
Cyberoam Anti Spam allows to:
• Scan email messages for spamming by protocols namely SMTP, POP3, IMAP
• Monitors and proactively detect recurrent patterns in spam mails and combat multi-format –
text, images, HTML etc. and multi-language threats
• Monitors mails received from Domain/IP address
• Detect spam mails using RBLs. If Anti Spam module is not subscribed, Cyberoam will detect
spam mails based on RBL only and not on recurrent patterns in mails.
• Accept/Reject messages based on message size and message header
• Customize protection of incoming and outgoing e-mail messages by defining scan policies
• Set different actions for SMTP, POP and IMAP spam mails
• Quarantine SMTP mails and release quarantine mails
• Configure action for individual email address
• Notify receivers about spam messages
• Configure Digest service to notify receivers about spam messages
Configuration
Configuration task for implementing spam solution:
1. Create Spam policy. Optionally use global or default policy provided by Cyberoam
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8. Cyberoam Anti Spam Implementation Guide
2. Create Spam rule for the policy created in step 1 i.e. create spam rule and attach policy to the
rule
3. Enable scanning from firewall rule
Spam Policy
As soon as you register Cyberoam Gateway Anti-spam module, default spam policy is applicable
to all the incoming email traffic. Default spam policy is the general policy and not fit-for-all policy
and hence might allow certain spam mails while block certain required mails also. Fine tuning the
policies means reducing the spam attacks and chances of loosing any important and required
mails.
Spam policy defines what action is to be taken if the mail is identified as a spam and to which
email address the copy of mail is to be send. As network scanning rules control all the traffic
passing through the Cyberoam and decide whether to scan or bypass mail, policy will be applied to
that traffic only that is filtered by network scanning rule.
To reduce the risk of losing the legitimate messages, Spam quarantine repository - a storage
location, provides administrators a way to automatically quarantine messages that are identified as
spam.
This will help in managing spam and probable spam quarantined mails and can take appropriate
actions on such mails.
Types of Policies
1. Global
Global policy is applicable to all the mail recipients i.e. Email address and Email address
groups. Cyberoam provides blank corporate policy which can be customized as per the
requirement.
2. Default
Default policy is applicable to all the recipients i.e. Email address and Email address group
except for those for whom the custom policy is defined. Default policy is applicable to all the
recipients as soon as you register the Anti Spam module.
3. Custom/Personal
Cyberoam allows defining custom policy for specific individual recipient or address group and
is applicable to only to those specific individual recipient or address group and not all the
recipients.
Scanning rules defines which scanning policy is to be applied to which recipient email address i.e.
maps scanning policy to the email address.
Detection of spam attributes
Cyberoam uses content filtering and three RBLs - Real time Black hole Lists – to check for the
spam attributes as well as POP3/IMAP mails:
• Message size
• Message header
• Premium RBL
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9. Cyberoam Anti Spam Implementation Guide
• Reliable RBL
• Standard RBL
RBL is a list of IP addresses whose owners refuse to stop the proliferation of spam i.e. are
responsible for spam or are hijacked for spam relay.
Cyberoam will check each RBL for the connecting IP address. If the IP address matches to the
one on the list then the specified action in policy is taken.
Actions
Accept – Accepts and delivers the mail to the intended receiver. This action can be defined for
both SMTP and POP/IMAP protocols.
Reject – Rejects the mail. This action sends the notification message to sender. This action can
be defined only for SMTP protocol.
Drop – Drops the mail. This action does not send any notification message to sender. This action
can be defined only for SMTP protocol.
Change Recipient - Accepts the mail but delivers the mail to the specified receiver and not to the
receiver for whom the mail was originally send. This action can be defined only for SMTP protocol
only.
Prefix Subject – Accepts and delivers the mail to the intended receiver but after changing the
subject of the mail. You can customize the subject in such a way that the receiver knows that the
mail is a spam mail. This action can be defined for both SMTP and POP/IMAP protocols.
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10. Cyberoam Anti Spam Implementation Guide
Global policy
Cyberoam provides the blank global policy which can be customized as per your requirement. By
default, global policy applies to all the users. There is no need to apply the global policy to the
users using rules.
Select Anti Spam Spam Policy Global policy to customize policy. Refer to Add
advanced rules for more details.
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11. Cyberoam Anti Spam Implementation Guide
Default policy
As soon as you subscribe Cyberoam Gateway Anti Spam, default spam policy is applicable to the
all incoming email traffic. Default spam policy is the general policy and not fit-for-all policy and
hence might allow certain spam mails while block certain required mails also.
Default policy can be customized as per your requirement. Default policy will be applied to those
users only for whom custom/personal policy is not defined.
As per your requirements, Cyberoam allows you to define multiple policies instead of single global
policy. Fine tuning the policies means reducing the spam attacks and chances of loosing any
important and required mails.
Select Anti Spam Spam Policy Default policy to customize policy. Refer to Add
advanced rules for more details.
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12. Cyberoam Anti Spam Implementation Guide
Custom policy
Custom scan policy allows you to specify the spam filtering level security i.e. action severity based
on your requirement.
Create Custom Scan policy
Select Anti Spam Spam policy Create Custom policy to open the create page
Screen - Create Custom Spam policy
Screen Elements Description
Spam Policy details
Name Specify policy name. Choose a name that best describes the policy
Send copy to email Specify email addresses to which the mail copy is to be send.
address
If Cyberoam detects the spam mail then it sends the spam notification to
the mail receiver. Cyberoam will forward such a mail to the receiver only if
configured in the Spam policy.
But in case you want Administrator or any other person in the organization
to know about spam and receive this spam mail then specify all the emails
address to whom you want to forward the copy of such mails.
More than one address can be specified using comma
For example
john@hotmail.com,,joe@yahoo.com
This option can be applied for SMTP protocol only
Policy Description Specify full description of the policy
Create button Creates the policy
Cancel button Cancels the current operation
Add button If the policy is successfully created, create advanced scanning rules to
specify what action is to be taken on mail identified as SPAM after
successful creation of the policy. Refer to Manage Custom Policy for more
detail for defining actions.
Table – Create Custom Spam policy screen elements
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13. Cyberoam Anti Spam Implementation Guide
Manage Custom Spam policy
Select Anti Spam Spam Policy Manage Custom policy to view the list of policies
created. Click the policy to be modified.
Screen – Manage Custom Spam policy
Screen Elements Description
Spam Policy details
Name Displays policy name
Send copy to email Displays email addresses to which the mail copy will be send,
address modify if required.
More than one address can be specified using comma
For example
john@hotmail.com,,joe@yahoo.com
This option can be applied for SMTP protocol only.
Policy Description Displays full description of the policy, modify if required
Update button Updates and saves modifications done in any of the above fields
Cancel button Cancels the current operation
Advanced Rules
Add button Click to define the action to be taken on mails if the matching
condition is found.
Refer Add Advanced Rules for details.
Table – Manage Custom Spam policy screen elements
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14. Cyberoam Anti Spam Implementation Guide
Add Advanced Rules
Select Anti Spam Spam Policy Manage Custom policy to view the list of policies
created. Click the policy to which action rules are to be added.
Conditions
• When Cyberoam Anti Spam identifies Mail as SPAM, Cyberoam accepts and delivers the mail
to the intended receiver but only after adding a prefix ‘SPAM’ to the original subject of the
mail.
Original subject: ‘This is a test’
Receiver will receive the mail with subject line as: ‘SPAM: This is a test’
You can customize the subject in such a way that the receiver knows that the mail is
a spam mail. To specify the contents to be prefixed to the existing subject line, select
‘Prefix Subject’ as action.
You can set different actions for SMTP and POP.
• When Cyberoam Anti Spam identifies Mail as PROBABLE SPAM, Cyberoam accepts and
delivers the mail to the intended receiver but after adding a prefix ‘PROBABLE SPAM’ to the
original subject of the mail.
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15. Cyberoam Anti Spam Implementation Guide
Original subject: ‘This is a test’
Receiver will receive the mail with subject line as: ‘PROBABLE SPAM: This is a test’
You can customize the subject in such a way that the receiver knows that the mail is
a spam mail. To specify the contents to be prefixed to the existing subject line, select
‘Prefix Subject’ as action.
You can set different actions for SMTP and POP.
• When Cyberoam Anti Spam identifies Mail as VIRUS OUTBREAK, Cyberoam accepts and
delivers the mail to the intended receiver but only after adding a prefix ‘SPAM’ to the original
subject of the mail.
Original subject: ‘This is a test’
Receiver will receive the mail with subject line as: ‘SPAM: This is a test’
You can customize the subject in such a way that the receiver knows that the mail is a
spam mail. To specify the contents to be prefixed to the existing subject line, select
‘Prefix Subject’ as action.
You can set different actions for SMTP and POP mails
• When Cyberoam Anti Spam identifies Mail as PROBABLE VIRUS OUTBREAK, Cyberoam
accepts and delivers the mail to the intended receiver but only after adding a prefix ‘SPAM’ to
the original subject of the mail.
Original subject: ‘This is a test’
Receiver will receive the mail with subject line as: ‘SPAM: This is a test’
You can customize the subject in such a way that the receiver knows that the mail is a
spam mail. To specify the contents to be prefixed to the existing subject line, select
‘Prefix Subject’ as action.
You can set different actions for SMTP and POP mails.
• From Email Address/IP address – Specified action will be taken if the mail sender email or IP
address matches the specified email address or IP address. You can set action for SMTP
only.
• From Email Address/IP address – Specified action will be taken if the mail sender email or IP
address belongs to the specified email address or IP address group. You can set action for
SMTP only.
• Message Size - Specified action will be taken if the mail size matches the specified size. You
can set different actions for SMTP and POP.
• Message Header - Specified action will be taken if the message header contains the specified
text. You can set different actions for SMTP and POP.
You can scan message header for spam in:
Subject – Specified action will be taken if the header contains the matching subject
From - Specified action will be taken if the header contains the matching text in the From
address.
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16. Cyberoam Anti Spam Implementation Guide
To - Specified action will be taken if the header contains the matching text in the To
address.
Others – Specified action will be taken if the matching text is found in the header
• RBL - Specified action will be taken if the sender is listed in the specified RBL Group. You
can set different actions for SMTP and POP mails.
Actions
Following actions can be taken on the mail identified as the SPAM, Probable SPAM, VIRUS
OUTBREAK or Probable VIRUS OUTBREAK
Protocol Action Meaning
SMTP Reject Mail is rejected and rejection notification is send to the mail
sender
SMTP Drop Mail is rejected but rejection notification is not send to the
mail sender
SMTP, Accept Mail is accepted and delivered to the intended receiver
POP3
SMTP Change Mail is accepted but is not delivered to the receiver for whom
Recipient the message was originally send.
Mail is send to the receiver specified in the spam policy
SMTP, Prefix Subject Mail is accepted and delivered to the intended receiver but
POP3 after tagging the subject line.
Tagging content is specified in spam policy.
You can customize subject tagging in such a way that the
receiver knows that the mail is a spam mail.
For Example
Contents to be prefixed to the original subject: ‘Spam
notification from Cyberoam – ‘
Original subject: ‘This is a test’
Receiver will receive mail with subject line as: ‘Spam
notification from Cyberoam - This is a test’
SMTP Quarantine Mail is quarantined and can be viewed or downloaded from
the quarantine area.
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Change Advanced action rules Order
Advanced action rules are ordered by their priority. When the rules are applied, they are processed
from the top downwards and the first suitable rule found is applied. Hence, while adding multiple
rules, it is necessary to put strict rules before moderate and general rules.
Select Anti Spam Manage Custom policy to view the list of policies created. Click the
policy whose action rule order is to be changed.
Click the rule whose order is to be changed
Click “Move Up” button to move the selected rule one-step up
Click “Move Down” button to move the selected rule one-step down
Click “Update Order” button to save the order
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Delete Custom Spam policy
• Prerequisite
• Not assigned any Rule
Select Anti Spam Spam policy Manage Custom policy to view the list of policies
created
Screen – Delete Custom Spam policy
Screen Elements Description
Del checkbox Click against the policy to be deleted
Select All checkbox Click to select all the policies for deletion
Delete button Click to delete all the selected policies
Table – Delete Custom Spam policy screen elements
Note
Default policy cannot be deleted.
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Address Groups
Scanning rule can be defined for individual or group of
• Email address
• IP address
• RBL (Real time black hole List)
Address group is the group of email addresses, IP addresses, or RBLs. Whenever the policy is
applied to the address group, policy is applied to all the addresses included in the group.
RBL is a list of IP addresses whose owners refuse to stop the proliferation of spam i.e. are
responsible for spam or are hijacked for spam relay. This IP addresses might also be used for
spreading virus.
Cyberoam will check each RBL for the connecting IP address. If the IP address matches to the
one on the list then the specified action in policy is taken.
Create Address Groups
Select Anti Spam Configuration Address Groups to open the Address group page.
Click Create to open the create page.
Screen – Create Email Address Group
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20. Cyberoam Anti Spam Implementation Guide
Screen Elements Description
Address Group details
Name Specify group name
Group Specify group type. You can create group of RBLs, IP address or
Email address.
RBL is a list of IP addresses whose owners refuse to stop the
proliferation of spam i.e. are responsible for spam or are hijacked
for spam relay.
Cyberoam will check each RBL for the connecting IP address. If the
IP address matches to the one on the list then the specified action
in policy is taken.
Description Specify full description
Create button Creates group and depending on the group type allows adding
email address, IP addresses or RBL names
Click “Add “
Type all the email addresses to be grouped specified by comma
e.g. john@yahoo.com, joe@hotmail.com
Cancel button Cancels the current operation
Table – Create Email Address Group screen elements
Delete Address Groups
Select Anti Spam Configuration Address Groups to view the list of groups created
Screen – Delete Address Group
Screen Elements Description
Del checkbox Click against the address group to be deleted
Select All checkbox Click to select all the address group(s) for deletion
Delete button Click to delete all the selected address group(s)
Table – Delete Address Group screen elements
Delete individual address from Group
Select Anti Spam Configuration Address Groups to view the list of groups created.
Click the group from which the address is to be deleted
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21. Cyberoam Anti Spam Implementation Guide
Screen – Delete Address from Group
Screen Elements Description
Del checkbox Click against the address to be deleted
Select All checkbox Click to select all the address (s) for deletion
Delete button Click to delete all the selected address (s)
Table – Delete Address from Group screen elements
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Spam Rule
Scanning rules defines which scanning policy is to be applied to which recipient email address i.e.
map scanning policy with the email address.
A rule allows to apply:
• single policy for a email address or group of addresses
• multiple policies for a particular email address or group of addresses
Create Spam rule
Prerequisite
• Policy created
• Address group created (if rule is for group)
Select Anti Spam Spam Rules to open the create page
Screen - Create Spam Rule
Screen Elements Description
Spam Rule Details
Action Item Select whether the rule is for individual email address or group
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23. Cyberoam Anti Spam Implementation Guide
Screen Elements Description
Recipient Email Specify recipient email address
Address
If the rule is for the complete domain the specify as @domainname
If Action Item is e.g. @cyberoam.com
“Recipient Email
Address”
Address Group Specify address group
If Action Item is
“Address Group”
Policy Name Specify policy to be applied.
According to the action specified in the policy, mails will be
delivered as original or will be tagged and forwarded to the receiver.
Add button Creates rule
Cancel button Cancels the current operation
Table – Create Spam Rule screen elements
Delete Spam Rule
Select Anti Spam Spam Rules to view the list of rules created.
Screen - Delete Spam Rule
Screen Elements Description
Del checkbox Click against the rule(s) to be deleted
Select All checkbox Click to select all the rule(s) for deletion
Delete button Click to delete all the selected rule(s)
Table – Delete Spam Rule screen elements
Change Spam rule Order
Rules are ordered by their priority. When the rules are applied, they are processed from the top
downwards and the first suitable rule found is applied. Hence, while adding multiple rules, it is
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24. Cyberoam Anti Spam Implementation Guide
necessary to put strict rules before moderate and general rules. Default policy order cannot be
changes.
Select Anti Spam Spam Rules
Click the rule whose order is to be changed
Click “Move Up” button to move the selected rule one-step up
Click “Move Down” button to move the selected rule one-step down
Click “Update Order” button to save the order
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25. Cyberoam Anti Spam Implementation Guide
Local Domains
Cyberoam also allows bypassing RBL scanning of mails for certain domains. To bypass RBL
scanning of certain domains, define such domains as trusted domains
Add Domains
Select Anti Spam Configuration Local Domains, type Domain name or IP address
and click “Add” button.
Cyberoam will not perform RBL-based scanning for the mails from the configured domains.
Delete Domains
Select Anti Spam Configuration Local Domain to view the list of domains that will
be bypassed from RBL scanning
Screen Elements Description
Del checkbox Click against the domain to be deleted
Select All checkbox Click to select all the domain(s) for deletion
Delete button Click to delete all the selected domain(s)
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26. Cyberoam Anti Spam Implementation Guide
Enable Scanning
Enable anti-spam scanning using firewall rules. While anti-spam settings can be configured for
system-wide use, they can also be implemented with specific settings on a per user basis. Refer to
Cyberoam User Guide, Firewall section for creating firewall rules for enabling the anti-spam
scanning.
You can enable anti spam scanning by creating firewall rule for:
• Zone
• User/User Group
• Host/Host Group
By enabling scanning through firewall, you can customize levels of protection. For example, while
traffic between LAN and WAN might need strict protection, traffic between trusted internal
addresses might need moderate protection. Hence you can enable/disable scanning for particular
combination of source and destination IP address or domain.
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27. Cyberoam Anti Spam Implementation Guide
General Configuration
Select Anti Spam Configuration General Configuration to open the configuration
page
• If Anti spam module is not subscribed configuration page will display the message that
module is not subscribed and Cyberoam will not detect spam mails
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Screen Elements Description
Anti Spam Engine information
Anti Spam Engine Anti Spam Engine status
Information
- Anti Spam server is down
- Anti Spam server is up
Cyberoam Anti Spam Center connectivity status
- Cyberoam is not connected and will not be able to detect
spam mails
- Cyberoam is connected with Cyberoam Anti Spam Center’s
server
Cyberoam Anti spam definition database contains currently
identified spam signatures/definitions which are used for identifying
spam mails. By default, database updates are automatically
downloaded and installed on your computer every 30 minutes.
Settings
Bypass Spam check for Click “Bypass Spam check for SMTP authenticated Connections”
SMTP authenticated checkbox to enforce RBL and RPD based spam checking. If
Connections enabled, SMTP authenticated connections are bypassed from RBL
and RPD based spam checking. By default, it is enabled.
Verify Sender’s IP Enable IP reputation, if you want to verify the reputation of the
reputation sender IP address. Cyberoam dynamically checks the sender IP
address and denies SMTP connection if IP address is found to be
responsible for sending spam mails or malicious contents.
If both “Bypass Spam check for SMTP authenticated Connections”
and “Verify Sender’s IP reputation” are enabled, for the
authenticated connections, spam scanning based on RBL and RPD
will be given the precedence.
Feature will be available only on purchase of new license of
Gateway Anti Spam module.
SMTP Mails greater Specify maximum file size (in KB) for scanning.
than size
Files exceeding this size received through SMTP will not be
scanned.
Over Sized Mail Action Specify the action to be taken on oversize mails.
Available option
Accept - All the oversize mails will be forwarded to the recipient
without scanning
Reject – All the oversized mails are rejected and notification
message is send to the mail sender.
Drop – All the oversized mails are dropped.
By default, files exceeding 50 MB will not be scanned.
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29. Cyberoam Anti Spam Implementation Guide
Screen Elements Description
POP3/IMAP Mails Specify maximum size (in KB) of the file to be scanned. Files
greater than size exceeding this size received through POP/IMAP will not be scanned
and forwarded to the recipient without scanning.
By default, files exceeding 10 MB will not be scanned.
Quarantine Area
Total Utilization ( Anti Displays percentage of quarantined spam and virus infected
Virus + Anti Spam ) messages.
Click to search or download any quarantined mail. Quarantined
mails can be searched based on sender email address, receiver
email address, and subject.
Cyberoam reserves 5GB for Quarantine area. To maintain the total
size of Quarantine area, Cyberoam removes older mails once the
repository is filled by 80% i.e. once the repository level crosses
4GB, Cyberoam automatically deletes the oldest quarantined mails.
Cyberoam stores Quarantined mail in Quarantine area (repository)
and Log area. Log area is purged as per the days configured in the
Auto Purge utility while Quarantine area is purged once the
repository is filled by 80%. Due to this, there are chances of
utilization of Quarantine area but no quarantined mails are available
to download when you click Quarantine area.
Cyberoam recommends to download the quarantine mails before
they are purged from the Log area. Check the purge configuration
from System>Manage Data>Configure Auto Purge Utility page
Update button Click to save the configuration
Header to detect recipient for POP3/IMAP
Click Add to specify header which should be used for detecting the
recipient’s address.
By default, Cyberoam uses Delivered-To and Received headers.
Default headers cannot be deleted
Spam Digest
Spam digest is an email and contains a list of quarantined spam messages filtered by Cyberoam
and held in the user quarantine area. If configured, Cyberoam mails the spam digest as per the
configured frequency to the user. Digest provides a link of User My Account from where user can
access his quarantined messages and take the required action.
• Configure Digest service
• Release Quarantined Spam mail
Configure Digest Service
Digest service can be configured globally for all the users or for individual users. Cyberoam mails
the spam digest as per the configured frequency to the user.
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30. Cyberoam Anti Spam Implementation Guide
The Spam Digest provides following information for each quarantined message:
• Date and time: Date and time when message was received
• Sender: Email address of the sender
• Recipient: Email address of the receiver
• Subject: Subject of the message
Select Anti Spam Spam Quarantine Spam Digest Settings to open the digest
configuration page
Screen Elements Description
Spam Quarantine Digest Settings
Enable Spam Click to enable digest service for all the users
Quarantine Digest
Email Frequency Configure spam digest mail frequency.
Digest can be mailed every hour, every day at configured time or
every week on the configured day and time.
Send Test Spam Digest Click and specify the email address to send the test spam digest
button mail
From email Address Specify mail address from which the mail should be send. Digest
mail will be send from the configured mail address.
Display Name Specify mail sender name. Digest mail will be send with the
configured name.
Reference “MyAccount” Select Interface/Port IP from the ‘Reference “MyAccount” IP’
IP dropdown list. User My Account link in Digest mail will point to this
IP address. User can click the link to access his quarantined
messages and take the required action. The users not falling under
the specified Interface will have to access the quarantine mail
directly from their MyAccount.
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31. Cyberoam Anti Spam Implementation Guide
Screen Elements Description
Allow Override Click “Allow user to override digest setting”, if you want each user to
override the digest setting i.e. user can disable the digest service so
that they do not receive the spam digest.
Apply button Click to save the configuration
Change User’s Spam Click to change the digest setting of the individual user. It opens a
Digest Settings button new page which allows selecting group and updating the spam
digest setting of group members.
Release Quarantined Spam mail
Either Administrator or user himself can release the quarantined spam mails. Administrator can
release the quarantined spam mails from Quarantine area while user can release from his My
Account. Released quarantined spam mails are delivered to the intended recipient’s inbox.
Administrator can access Spam Quarantine area from Anti Spam > Configuration > General
Configuration while user can logon to My Account and access Spam Quarantine area from
Quarantine Mails > Spam > Spam Quarantine area.
If Spam Digest is configured, user will be mailed Digest which consists of all the quarantined spam
mails.
Bypass Reporting
By default, Cyberoam Anti Spam generates reports for all the Internal Domains and Email Ids. To
bypass reporting of certain domains and email ids, Administrator has to create an Exclusion
domain list and email id list. All the domains and email ids included in the exclusion list will not be
included in the Anti Spam reports.
To define the exclusion list, select Reports Configure Local Domains or select
Reports Configure Bypass Email Ids
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