feedmail-confirm-outgoing

feedmail-confirm-outgoing is a variable defined in `feedmail.el'.
Its value is

nil

Documentation:
If non-nil, give a y-or-n confirmation prompt before sending mail.
This is done after the message is completely prepped, and you'll be
looking at the top of the message in a buffer when you get the prompt.
If set to the symbol 'queued, give the confirmation prompt only while
running the queue (however, the prompt is always suppressed if you are
processing the queue via `feedmail-run-the-queue-no-prompts'). If set
to the symbol 'immediate, give the confirmation prompt only when
sending immediately. For any other non-nil value, prompt in both
cases. You can give a timeout for the prompt; see variable
`feedmail-confirm-outgoing-timeout'.

You can customize this variable.