If you really want to use maildir, you can have procmail deliver to maildirs: (in .procmailrc): DEFAULT=$HOME/Maildir/

Note the trailing slash - that's the kicker.

Then tell Dovecot to use maildir.

If you want to mix and match mailbox formats per user, then you'll need to use an auth database that allows setting this (passwd-file, or maybe ldap or sql).

Thanks, Jon! I think now I get the picture. I will start playing around with procmail and the with dovecot auth options.

Carsten