Andreas Jaeger <aj@suse.de> writes:

> Can anybody help me here?  I looked through the manual and through the
> sources but couldn't find anything.  The idea sounds fine,

In my case procmail is splitting mail into mbox-folders within two
directories 'incoming-nnfolder' and 'incoming-nnml'. Gnus will copy
per-folder from these directories via 'mail-sources' into nnfolder and
nnml groups.

The only way I got this working is by changing the key binding of 'g'
for getting new mail to a function that runs gnus-group-get-new-news
twice in different environments:

------------------------------------------------------------>8----------
(setq gnus-select-method '(nntp "news.vr.in-berlin.de"))

(setq gnus-secondary-select-methods '((nnfolder "") (nnml "")))

(defun my-gnus-group-get-new-news (&optional foo) (interactive "i")
  (let (mail-sources)
    (let ((gnus-secondary-select-methods '((nnml "") (nnfolder ""))))
      (setq mail-sources
            '((directory :path "~/Mail/incoming-nnml"
                         :suffix ""
                         :plugged t)))
      (gnus-group-get-new-news))
    (setq mail-sources
          '((file :plugged t)
            (directory :path "~/Mail/incoming-nnfolder"
                       :suffix ""
                       :plugged t)))
    (gnus-group-get-new-news)))

(add-hook 'gnus-group-mode-hook
          '(lambda()
             (local-set-key ?g 'my-gnus-group-get-new-news)))
----------8<------------------------------------------------------------

This approach was suggested some time ago in a News posting.

It makes Gnus check twice for new News articles as well. Trying to
avoid this, I have set gnus-select-method first to (nnml "")
                   and gnus-secondary-select-method to nil,

so that new News articles would be checked for only once. But, for
unknown reasons the process of getting mail from these local folders
then gets quite slow.

Since Gnus does not support this way of using two backends for local
mail retrieval, there is probably something strange with this
approach. Is there a better one, that allows using procmail to split
mails, and makes Gnus getting it into nnml or nnfolder groups,
depending on folder name?

-- 
Michael