James B. Byrne:
> On our IMAP service host I am seeing messages in the mailq similar to
> the following:
>
> 50DFB12B2F7 7501 Tue Nov 6 17:22:42 MAILER-DAEMON
> (delivery temporarily suspended: Host or domain name not found. Name
> service error for name=mx31.harte-lyne.ca type=MX: Host not found, try
> again)
>
> Postfix on the IMAP host is configured to route outgoing mail through
> MX31. And mail is flowing in and out of the IMAP system. Most things
> are being delivered. But a few messages are stuck in the mail queue
> with this error and I cannot figure out what the problem with them is.
>
> I have confirmed that the DNS resolver on both the IMAP host and MX31
> are working. I can ping from the IMAP host to MX31. On the IMAP host
> I can use swaks to successfully send mail via the localhost. On the
> IMAP host I can also use swaks to successfully send mail via MX31.
> The test messages both arrived in the destination mailbox on the IMAP
> host.
>
> I do not understand what the DNS issue is, but I cannot flush
> messages with this error.
Are your services chrooted?
$ postconf -F '*/unix/chroot' | grep '\= y'
Those will not use the name server configured in /etc/resolv.conf,
but rather, the one configured in $queue_directory/etc/resolv.conf.
Wietse
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