You need to configure Dovecot to create the auth-master socket.
http://wiki.dovecot.org/LDA#Virtual_users
I have it working now, it wasn't working because the parent directory of
auth_master didn't exist. I modified the wiki to include that this path has
to exist and is not created automatically (ie: /var/run/dovecot).
Another question to which I couldn't find the answer in the wiki is whether
'lda' should be added to the protocols line in the configuration, such that
it becomes:
protocols pop3 pop3s imap imaps lda
Sincerely,
- Wouter van der Schagt
