How do I undo sending a message?

After you send a message, you'll see a banner at the top with the option to Undo. Click that to stop sending the email and see the draft again. You can also use the 'Q' keyboard shortcut immediately after sending an email to undo the send.

Screenshot showing the Undo option after sending a message.

Undo Sending can be toggled through Accounts & Settings > Undo Sending. Accounts created after December 2022 will have this enabled by default.