1. Send Mail Later
Sometimes you want to send e-mail in the future, but you are authoring them in the right now. Instead of creating drafts and having to set reminders to come back and send them. You can just schedule your emails as you compose them.
2. Remind Me to Followup
It is common that I will respond to someone via email and hope that they respond back. I have gotten pretty good in Things for handling this, but for many this is still a problem. Boomerang let’s you set an email to come back in your email box based on several conditions. For example, if by a certain day the recipient doesn’t reply.
3. Recurring Email
If you have a recurring email you want sent Boomerang can handle that too. I never use this feature but it is available if you have the need to send recurring emails.