On Sat, Feb 15, 2025 at 10:54:58AM +0200, Nikolaos Milas via Postfix-users
wrote:
> On 15/2/2025 1:45 π.μ., Wietse Venema via Postfix-users wrote:
> > It is possible to override these system library functions by providing
> > your own alternatives with LD_PRELOAD.
>
> Thanks Wietse, it makes sense.
>
> Would it be sufficient to LD_PRELOAD 2.34 libs for smptd or we should do so
> for other executables like postscreen?
No, this is at best going to work for a diagnostic test. Not suitable
for "production".
I don't recall seeing you testing with "getaddrinfo" (and perhaps also
"getnameinfo" to see whether it is slow PTR lookup that is the problem).
It may also help to perform tcpdumps to see how long the delay is
between that client connecting and the Postfix 220 greeting.
Until you understand the problem, there's no solution.
--
Viktor.
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