One of the things that separate the mail back ends from the rest of the
back ends is the heavy dependence by the mail back ends on common
functions in `nnmail.el'. For instance, here's the definition of
nnml-request-scan
:
(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,
and nnmail
takes care of all the moving and splitting of the
mail.
This function takes four parameters.
nnmail-get-new-mail
will call back-end-save-mail
to
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:
back-end-get-new-mail
(to see whether to get new mail for
this back end); and back-end-group-alist
and
back-end-active-file
to generate the new active file.
back-end-group-alist
should be a group-active alist, like
this:
(("a-group" (1 . 10)) ("some-group" (34 . 39)))
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