[pfx] Re: Delays of few seconds are often observed in send mail

Lafiel Elentari via Postfix-users <[email protected]> Wed, 27 May 2026 23:11:20 +0300

Newsgroups	gmane.mail.postfix.user
Message-ID	<[email protected]>

Hello.

I didn't even think about possible DNS problem.

It looks like problem has been fixed in Unbound server:
https://wiki.archlinux.org/title/Unbound#First_lookup_fails_after_start

In my case, I had to increase `max-global-quota` parameter to `500` with
some margin. The problem persists even with a value of `300`.

Thanks!


You wrote on 2026.05.27, at 22:22:20:
> You have a problem with SMTP client hostname lookup;

>     may 20 21:20:30 mail postfix/smtpd[2501]: connection established
>     ...
>     may 20 21:20:35 mail postfix/smtpd[2501]: connect from unknown[2a0d:..:a484]

> A 5-second delay is typical for a DNS query timing out. Consider
> listing the client in /etc/hosts, or, if you are brave, have fun
> with networkmanager etc. to fix your DNS infrastructure.

>         Wietse
> _______________________________________________
> Postfix-users mailing list -- [email protected]
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-- 
Best regards,
Lafiel Elentari
mailto:[email protected]

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