[pfx] Re: Postfix not doing round robin for equal weight MX records

[Wietse Venema via Postfix-users]

John Doe via Postfix-users:
> We have enabled TLS on nlp3 and all traffic is even now :)
> Now it's time for a change to be able to reuse connections for TLS.

That would be:

smtp_tls_connection_reuse = yes

Available in Postfix 3.4 and later. As you have found, connection
reuse speeds up deliveries; the difference is even larger with TLS.

Wietse
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[pfx] Re: Postfix not doing round robin for equal weight MX records

[John Doe via Postfix-users]

niedz., 12 maj 2024 o 19:10 Wietse Venema via Postfix-users <
postfix-users@postfix.org> napisał(a):

> Viktor Dukhovni via Postfix-users:
> > On Fri, May 10, 2024 at 01:13:06PM -0400, Wietse Venema via
> Postfix-users wrote:
>
> ...

Mystery solved.
Thank You Wietse and Viktor for tips about my issue.

conn_use in logs showed something interesting ...
This one nlp3 was having TLS disabled, and I've missed that somehow, so by
default it was reusing connections.
Rest of relays had TLS enabled, and I don't reuse connections for TLS, so
no conn_use in logs on my side.
I even wote simple script to connect 50 times to each, wait for 220 code,
quit, calculate latency - this showed that nlp3 is not the fastest one.
Networks were all 24 bit ...

We have enabled TLS on nlp3 and all traffic is even now :)
Now it's time for a change to be able to reuse connections for TLS.

Best regards,
Thank You!
John
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