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When postfix connects to the FQDN it uses the external IP address:

root@dur:~# tail /var/log/mail.log
Aug 28 04:39:45 dur postfix/master[6667]: terminating on signal 15
Aug 28 04:39:46 dur postfix/postfix-script[6781]: starting the Postfix mail system
Aug 28 04:39:46 dur postfix/master[6782]: daemon started -- version 2.9.1, configuration /etc/postfix
Aug 28 04:39:52 dur postfix/smtpd[6786]: connect from localhost[]
Aug 28 04:40:37 dur postfix/smtpd[6786]: B92B518431A: client=localhost[]
Aug 28 04:41:21 dur postfix/cleanup[6790]: B92B518431A: message-id=<>
Aug 28 04:41:22 dur postfix/qmgr[6784]: B92B518431A: from=<>, size=438, nrcpt=1 (queue active)
Aug 28 04:41:23 dur postfix/smtp[6792]: connect to[]:25: Connection refused
Aug 28 04:41:23 dur postfix/smtp[6792]: B92B518431A: to=<>, relay=none, delay=62, delays=60/0.02/1.6/0, dsn=4.4.1, status=deferred (connect to[]:25: Connection refused)
Aug 28 04:41:26 dur postfix/smtpd[6786]: disconnect from localhost[]

What's causing the FQDN to behave this way?

Can I, and should I, and how would I, configure to resolve to

share|improve this question
Because resolves to – Ulrich Dangel Aug 28 '12 at 12:54
Make sure your postfix is correctly configured, especially the parameter mydestination. See – angus Aug 28 '12 at 21:50

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