We have noticed in our Postfix log a lot of error Temporary lookup failure. They seem to appear randomly. These errors did happen on well-known domains like gmail.com so it shouldn't be related to DNS issue.

Here's how it looks like:

Dec 16 02:44:15 prod2 postfix/smtpd[15673]: NOQUEUE: reject:
RCPT from mx1.example.com[1.2.3.4]: 451 4.3.0 <[email protected]>:
Temporary lookup failure; from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<[172.17.0.7]>

We haven't found any pattern for now so any idea on what might go wrong is helpful!

2

1 Answer

The message means that postfix on the server prod2 is unable to lookup some of its tables (like aliases or similar) due to them being out of sync with hashmaps (corresponding .db files) or due to incorrect values in the tables. Check your postfix logs for other warnings.

1

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