The document outlines 14 common mistakes made in email marketing. These mistakes include purchasing email lists instead of building your own list, sending emails to outdated lists, waiting until the last minute to send emails, having inconsistent branding in emails, sending emails with poor design, assuming permission from recipients, adding business card contacts without permission, using a "spray and pray" strategy, not understanding the purpose of email marketing, sending emails sporadically without consistency, using boring content, only including one large image, only sending HTML emails, and not designing emails for multiple email clients and devices. The document encourages downloading an eBook for more email marketing tips.