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Although this question has been asked before, there was no accepted answer (and the quality of answers was not good).

For one site where I send emails to, the "in queue manager" delay metric is (on average) 50 times greater than any other provider. However I am struggling to find a canonical (or even generic) explanation of what is happening during this window. That is my starting point for remediating the issue or at least mitigating its impact on the active queue.

My average delays:

delays=2057/10.25/0.35/0.36

The problem site:

delays=715/463.7/0.8/1.4

Specifically its the second figure - 463.7 causing the issue. Both datasets averaged over >10000 emails.

(I'm not concerned about the volume of deferred email and before anyone mentions DNS - according to the 2.3.13 release notes DNS lookups are reported in the NEXT metric).

symcbean
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1 Answers1

-1

You may tweak the following config parameters

maximal_queue_lifetime, maximal_backoff_time, or smtp_destination_concurrency_limit

You could also install a local dns Resolver like unbound. By caching DNS queries locally, Unbound can reduce the time it takes for your mail server to resolve domain names. This reduces latency, which can improve the overall responsiveness of your mail server, particularly when sending emails to multiple domains.

Turdie
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