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.
--
*** e-Mail is NOT a SECURE channel ***
Do NOT transmit sensitive data via e-Mail
Do NOT open attachments nor follow links sent by e-Mail
James B. Byrne mailto:byrn...@harte-lyne.ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3
