feedmail-queue-runner-mode-setter

feedmail-queue-runner-mode-setter is a variable defined in `feedmail.el'.
Its value is

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

Documentation:
A function to set the proper mode of a message file.
Called when the message is 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'.

Most people want `mail-mode', so the default value is an anonymous
function which is just a wrapper to ignore the supplied argument when
calling it, but here's your chance to have something different.
If you are a VM user, you might like feedmail-vm-mail-mode, though you
really don't need that (and it's not particularly well-tested).

Called with funcall, not `call-interactively'.

You can customize this variable.