How to enable Undo Send in Roundcube
This tutorial assumes you have the Email Scheduler plugin installed. If you don't, you can find the Undo Send feature on the Atlas platform or as a Download here
Once you have the Email Scheduler plugin installed it will show up in the Apps menu. Choose the Email Scheduler option.
Change the Countdown before sending messages from Disabled to a number, we suggest 10 seconds to give you enough time to quickly scan your email before sending.
Now, whenever you send an email, you have the choice to cancel for any last minute edits or send straight away.