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How do I deal with “CNAME lookup failed temporarily\?

April 26, 2017deal failed lookup temporarily

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How do I deal with “CNAME lookup failed temporarily\?

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The log showed that a message was deferred for this reason. Why is qmail doing CNAME lookups, anyway? Answer: The SMTP standard does not permit aliased hostnames, so qmail has to do a CNAME lookup in DNS for every sender and recipient host. If the relevant DNS server is down, qmail defers the message. It will try again soon. 3. Routing incoming messages by host 3.1.