Linkcheck: > Sorry Wietse, I thought it might be the other way around: postfix > wasn't picking up the dovecot reference.
There is a real protocol between Postfix and Dovecot. Postfix will complain when it is unable to speak that protocol with Dovecot, or when it receives an unexpected response. For example, Postfix logs a warning when it is configured to talk to the auth-userdb socket instead of the auth-client socket. And I see an auth-userdb socket in your configuration. I suggest that you start looking for Postfix "warning:" messages. The protocol messages are also logged with "smtpd -v" in master.cf (after you change the file, execute "postfix reload"), but this should not be needed. The existing warnings should be sufficient. Wietse