feedmail-queue-runner-message-sender

feedmail-queue-runner-message-sender is a variable defined in `feedmail.el'.
Its value is

(lambda (&optional arg) (mail-send))

Documentation:
Function to initiate sending a message file.
Called for each message read back out of the queue directory with a
single argument, the optional argument used in the call to
`feedmail-run-the-queue' or `feedmail-run-the-queue-no-prompts'.
Interactively, that argument will be the prefix argument.
Most people want `mail-send' (bound to C-c C-s in mail-mode), but here's
your chance to have something different. The default value is just a
wrapper function which discards the optional argument and calls
mail-send. If you are a VM user, you might like vm-mail-send, though
you really don't need that. Called with funcall, not call-interactively.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.