Undo Send 1.6
by 500030ML
After you click Send, the message waits a moment (10 seconds by default, adjustable up to a minute) so you can still cancel it – just like Undo Send in Apple Mail.
About this Add-on
• The compose window is minimized and a small countdown window appears.
• You can keep working in Thunderbird while the countdown runs.
• Move the countdown window wherever you like – next time it appears in the same place.
• Undo Send (or ⌘Z / Esc) cancels sending and brings the message back for editing.
• Send Now (or Enter, or closing the countdown) sends immediately.
• If you do nothing, the message is sent when the countdown ends.
• In the add-on's Options you can set the countdown length from 1 to 60 seconds (default 10).
No data collection, no network access. Works with Thunderbird 128 and later. Compatible with Send Later – scheduled messages are not delayed.