Peak mobile times are early morning and late evening, so send times should consider subscribers who primarily use mobile. People generally click less on mobile than desktop due to usability, trust, and time constraints. While some think people will open messages later on desktop, data shows just 2-3% of emails are opened on both platforms, so the first open is the main opportunity to engage users. One brand saw 16% of click-throughs from people who didn't fully open or download images in emails. For one customer studied over 30 days, 60% of email opens occurred only on mobile devices.