Last few days, I'm seeing large amount of failures in a log file for
domains using protection.outlook.com:
to=<u...@example.com>, relay=none, delay=13190, delays=13187/0.08/2.2/0,
dsn=4.4.3, status=deferred (Host or domain name not found. Name service
error for name=example-com.mail.protection.outlook.com type=AAAA: Host
not found, try again)
These domains do have A records, but some of them can take anywhere from
.75 of a second to 3 seconds to return a result from DNS lookup (using
dig).
When postfix reports it cannot find AAAA record, can I assume every time
it retries it also looks for the A record?
Is the problem a lookup timeout? Never seen this before the last few
days, so am inclined to think it's mostly their problem, or is there
something I could do?
- DNS problem (protection.outlook.com) MRob
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