Mapping of group names to filenames with nnml

[Andrew Nesbit <alnesbit@optushome.com.au>]

Hi, I just need to get this clear so that I can get my
Procmail-filtering recipes working nicely with Gnus.  I can't find the
answers in the manual, nor the FAQ.  If I've missed something, please
point me in the right direction.

I take it from experience that periods in group names cause nnml to
store these groups as a directory hierarchy.  For example,
`nnml:mail.misc' has its messages stored under mail/misc, relative to
the setting of `nnml-directory'.  Do any other characters in group
names have side-effects like this?  What about for other backends?

If I have a procmail-generated spool file named, say,
`debian.user.spool', combined with a mail-source specifier like

        (directory :path "~/Mail/Spool/"
                   :suffix ".spool")

then does that mean that the group will be called `debian.user' and
that nnml will create a directory hierarchy, as described above, to
store its messages?

Thanks for the help.

Andrew.