Dnia 24.05.2024 o godz. 20:41:57 Northwind via Postfix-users pisze:
> my guess, submission clients were using ehlo, and a mx client uses
> helo command. so postfix differ them based on this command?

They connect to different Postfix services. Submission clients connect to
port 587 or 465 (or any other port you configure in master.cf and use in your
submission client configuration), while MX clients connect to port 25.
-- 
Regards,
   Jaroslaw Rafa
   [email protected]
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."
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