I checked with the local users who had sent an email to the user and none had received an autoresponce.
I cleared the log and sent again. Same thing - no responce.
I checked the next 5 minutes of log after the mail arrived and there is no sent msg in the log.
It should respond straight away, shouldn't it?
I also checked the errors and warnings logs and they are empty.
I checked the mail queue and there is nothing in there.
The email was delivered to the users inbox.
(I also tried the autoresponder with a different user and same thing)
Here is the relevant extract from /var/log/mail/info:
May 15 09:02:35 mdserver postfix/smtpd: connect from unknown[188.8.131.52]
May 15 09:02:36 mdserver postfix/smtpd: setting up TLS connection from unknown[184.108.40.206]
May 15 09:02:38 mdserver postfix/smtpd: TLS connection established from unknown[220.127.116.11]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
May 15 09:02:40 mdserver postfix/smtpd: 0A6A568A25: client=unknown[18.104.22.168]
May 15 09:02:41 mdserver postfix/cleanup: 0A6A568A25: message-id=<firstname.lastname@example.org m>
May 15 09:02:41 mdserver postfix/qmgr: 0A6A568A25: from=<email@example.com>, size=1099, nrcpt=1 (queue active)
May 15 09:02:41 mdserver postfix/smtpd: disconnect from unknown[22.214.171.124]
USER with Autoresponder on.
May 15 09:03:26 mdserver postfix/local: 0A6A568A25: to=<firstname.lastname@example.org>, orig_to=<email@example.com>, relay=local, delay=46, delays=1.2/0.01/0/45, dsn=2.0.0, status=sent (delivered to command: /usr/bin/procmail -f-)
May 15 09:03:26 mdserver postfix/qmgr: 0A6A568A25: removed