I've been butting my head against this one for quite some time now. Given: a system that used to be running courier-mta which started getting on my nerves like crazy, which is why I decided to switch to the postfix/dovecot combo that almost everyone seems to use nowadays. What I had on the courier-system was a combination of accounts. Some of them were system-accounts (i.e. users with shell login and a .maildir in their home) and virtual accounts (i.e. users with no shell login that were present as subfolders under /home/vmail, owned by vmail, and those subfolders had .maildirs in them). Those two types of accounts live on the same domain (which is just the hostname of the machine).
Now I want that again. Dovecot is already up and running and works exactly as intended, i.e. system users can log in via some pam module, the virtual users with their passwords (encrypted) are defined in some config file under /etc/dovecot and both can log in and all is well. postfix is, for now, set up such that it allows the system-users to receive mail via smtp, but not the virtual users, because I've searched all howtos and docs and can't find out how to configure that. Every howto I've checked seems to assume that virtual users live under their own domain and never on the same domain as the system users. What works is that postfix checks against dovecot for login-credentials when mail-submission is used (port 587). So they do talk to each other. And whichever set of configs I tried (most of them via "just hand the mails to dovecot in some way or other") caused postfix to reject mails to either the system users, the virtual users or both with a "user unknown" error. So. Is this impossible? Or if it is possible, is there a howto that describes it? My google-fu on this one seems to be extremely weak as every query I try just gets me endless howtos for virtual domains. Thanks for any pointers.
