Dnia 25.07.2023 o godz. 21:44:21 John Levine via mailop pisze:
> It appears that Mike Hillyer via mailop <[email protected]> said:
> >So, before allowing access to submission service, Postfix consults IMAP 
> >server (Dovecot in this case) to check if there is actually a
> >currently existing authenticated IMAP session from that IP address. Only if 
> >such a session exists, connection is allowed and the client
> >may proceed to authentication attempt. Otherwise, the connection is 
> >immediately rejected.
> 
> This is a very old idea.  See https://en.wikipedia.org/wiki/POP_before_SMTP

Yes, I got the idea exactly from POP before SMTP. We may call it a modern
remake of POP before SMTP :)
-- 
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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