#57 CNAME lookup failed temporarily. (#4.4.3)

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qmail (23)
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2013-01-22
2012-10-09
No

lately users have been reporting deferals to few domains. The SMTP standard does not permit aliased hostnames, so qmail-remote has to do a CNAME lookup in DNS for every sender and recipient host. If the relevant DNS server is down, qmail-remote defers the message. It will try again soon.

This quering for T_ANY is an ancient misfeature and will be removed by adding an environment variable DISABLE_CNAME_LOOKUP in qmail-remote. Setting this variable will cause qmail-remote to skip dns_cname() function.

http://www.ornl.gov/lists/mailing-lists/qmail/2010/10/msg00018.html

http://marc.info/?l=qmail&m=134062672511072&w=2

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