How do I "unsend" an email from my Omail+ (Google) account?

Your OMail+ has an "Undo Send feature" which gives you a 10-second window to "undo" sending an outgoing email.

To set the time frame to undo your sent email:

1. Click on the Settings button (looks like a gear) in the top right of your Omail+ screen.

2. Click on See all settings.

3. On the General tab, go down to the section titled Undo Send, change the time you have to retract your sent email.