On Fri, Jun 12, 2015 at 11:05:32AM +0200, Denis Fondras wrote:
> (There is a high probability I did not understand the issue)
> 
> > 3. deliver to lmtp "/var/dovecot/lmtp"
> >   IMHO, the most easy and straight forward option, also preferred
> >   nowadays, due to better performance [2].  Not useable in my
> >   scenarios, as deliver_lmtp.c always uses the (system) user in
> >   RCPT TO.
> > 
> 
> I use "deliver to lmtp [socket]" with Dovecot virtual users on multiple 
> servers
> and haven't noticed any problem. The only user (apart from default users and
> daemon users) is my admin account.

And all your mails (no matter which address) end-up in the mailbox of
one of the two system user accounts, right?

With virtual users in the described (IMAP) context I meant: several
maildir mailboxes of (real virtual) users (IMAP authenticated by mail
address as username), but all handled by one underlying system user.
E.g you have a IMAP maildir folder layout with something like this:
/var/vmail/domain1/user1/
/var/vmail/domain1/user2/
/var/vmail/domain2/user1/
...
and all these folders are owned by a single uid/gid (vmail).

Think for example of about some hundred domains, with about 10-50 (real)
user accounts per domain. Then you do do not want to create x-thousand 
system users, anymore.

Regards,
Joerg

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