feedmail-vm-mail-mode

feedmail-vm-mail-mode is a compiled Lisp function in `feedmail.el'.

(feedmail-vm-mail-mode &optional ARG)

Make something like a buffer that has been created via `vm-mail'.
The optional argument is ignored and is just for argument compatibility with
`feedmail-queue-runner-mode-setter'. This function is suitable for being
applied to a file after you've just read it from disk: for example, a
feedmail FQM message file from a queue. You could use something like
this:

(setq auto-mode-alist (cons '("\\.fqm$" . feedmail-vm-mail-mode) auto-mode-alist))