With Postfix 2.8.4 I want to selectively disable relaying for certain SMTP-authenticated users, but unfortunately in this case I don't have access to the authentication database which is managed by a 3rd party auxprop_plugin. The same database is used for both SMTP and IMAP/POP3 authentication and there's no known mechanism at the moment to only disable SMTP authentication, but still allow IMAP/POP3 logins. At the same time, the server should still accept email that have these users' email address as the envelope sender. To make it even more complicated, everything is happening currently on port 25. I tried to use sender dependent authentication with a dedicated transport as described here: http://www.postfix.org/SASL_README.html#client_sasl_sender http://www.postfix.org/transport.5.html Now I have the following entry in /etc/postfix/main.cf:
sender_dependent_relayhost_maps = hash:/etc/postfix/relayhost_maps In /etc/postfix/relayhost_maps I have an entry like this: u...@domain.com error:sender can not be authenticated on this server Then, when sending an email from u...@domain.com after an SMTP-auth session I'd expect to get a bounce message with a non-delivery reason as per http://www.postfix.org/error.8.html, but instead I get something like this is syslog: postfix/smtpd[26240]: E67221280002: client=client[x.x.x.x], sasl_method=CRAM-MD5, sasl_username=u...@domain.com postfix/qmgr[24064]: E67221280002: from=u...@domain.com, size=1242, nrcpt=1 (queue active) postfix/smtp[26414]: fatal: unknown service: error sender can not be authenticated on this server/tcp postfix/smtpd[26240]: disconnect from client=client[x.x.x.x] postfix/qmgr[24064]: warning: private/server_ip- socket: malformed response postfix/qmgr[24064]: warning: transport server_ip- failure -- see a previous warning/fatal/panic logfile record for the problem description postfix/master[24062]: warning: process /usr/libexec/postfix/smtp pid 26414 exit status 1 postfix/master[24062]: warning: /usr/libexec/postfix/smtp: bad command startup -- throttling postfix/error[26248]: E67221280002: to=<us...@domain2.com>, relay=none, delay=1.4, delays=0.4/1/0/0, dsn=4.3.0, status=deferred (unknown mail transport error) Any idea, what am I missing to get this configured properly? Thanks, Adi
