Matthew via Postfix-users:
> Aug 26 19:01:51 SMTP postfix/smtpd[2101]: connect from
> unknown[XX.XX.XX.XX]
> Aug 26 19:01:52 SMTP postfix/smtpd[2101]: Anonymous TLS connection
> established from unknown[XX.XX.XX.XX]: TLSv1.2 with cipher
> ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)
Clearly, this VM has external connectivity. Assuming that the client
is 77.200.232.68 (see next logfile record), DNS is unable to look
up the name for that IP address (mta.mail.which.co.uk).
> Aug 26 19:01:52 SMTP postfix/smtpd[2101]: warning:
> 77.200.232.68.zen.spamhaus.org: RBL lookup error: Host or domain
> name not found. Name service error for
> name=XX.XX.XX.XX.zen.spamhaus.org type=A: Host not found, try again
> Aug 26 19:01:52 SMTP postfix/smtpd[2101]: warning:
> 77.200.232.68.bl.spamcop.net: RBL lookup error: Host or domain name
> not found. Name service error for name=XX.XX.XX.XX.bl.spamcop.net
> type=A: Host not found, try again
We already know that DNS is borked, and that the VM has external
connectivity.
What DNS resolver are you using? Can you use a better one?
Avoid the ones that are optimized for desktop users.
Are you running Postfix smtpd chrooted? Report output from:
postconf -F smtp/inet/chroot
postconf -F submissions/inet/chroot
If chrooted, does the problem go away if you turn off chroot?
postconf -F '*/inet/chroot=n'
postfix reload
If chrooted, is the file /var/spool/postfix/etc/resolv.conf up-to-date
BEFORE Postfix is started?
Running Postfix chrooted on Linux is like fighting windmills. Don't
waste your time on that.
Wietse
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