One of the things that separate the mail back ends from the rest of the
back ends is the heavy dependence by most of the mail back ends on
common functions in nnmail.el. For instance, here's the
(deffoo nnml-request-scan (&optional group server) (setq nnml-article-file-alist nil) (nnmail-get-new-mail 'nnml 'nnml-save-nov nnml-directory group))
It simply calls
nnmail-get-new-mail with a few parameters,
nnmail takes care of all the moving and splitting of the
This function takes four parameters.
nnmail-get-new-mail will call back-end
save each article. back-end
-active-number will be called to
find the article number assigned to this article.
The function also uses the following variables:
-get-new-mail (to see whether to get new mail for
this back end); and back-end
-active-file to generate the new active file.
-group-alist should be a group-active alist, like
(("a-group" (1 . 10)) ("some-group" (34 . 39)))