text: Help requested setting up mail on my Debian stable system
  I'm running getmail (from cron) to get mail from my various (pop)
  mailboxes, putting it into my ~/Maildir from which Dovecot dishes it up to
  my imap-speaking mail clients (local or remote). This gets all mail for my
  domains including some for other members of my family: I want to be able
  to deliver theirs to them (to be served by dovecot).
  I could use procmail or maildrop to filter mail for the other users
  and pass it to them - but how? Procmail's documentation advises that it is
  not intended for doing this: presumably it should call an MTA (this distro
  has exim installed) to deliver mail to other users.
  I guess that exim will deliver to users' /var/spool/mail/<username> mail
  spools (That's where system mail for me goes, and I fire up mutt from
  time to time to check it). I need to either get exim to deliver to Maildirs
  (if it can do so) or reconfigure dovecot to serve up mailspools as well
  as Maildirs. From my tenuous grasp on Dovecot's documentation I think it
  can do this with namespaces.
  Does this sound like the right approach, and if so has anyone done
  this already? Much as I value the Learning Experience of working it out
  from scratch at the moment there's a pressure to Just Get It Working. I'd
  particularly appreciate help with
  * procmail or maildrop config to invoke exim to pass message to other user
  * dovecot config to serve messages from Maildir and mail spool
  --
  John Stumbles
  I'm more non-competitive than you