Dnia 15.08.2023 o godz. 16:14:58 pgnd via Postfix-users pisze:
> they come in frequent waves of ~5-10 from countless different outlook.com
> hosts -- but, so far, these waves (and totals) are ONLY from outlook.com
> -- getting by postscreen cache after expire with "PASS NEW".
> 
> i never receive content with these; i just see the connect->disconnect
> sequence.  protections appear to be doing what they should.
> 
> OK mail from outlook does make it's way thru; e.g., since Monday,
> 
>   xzegrep "250 2.0.0 Queued as.*outbound.protection.outlook.com" 
> /var/log/postfix/postfix.log | wc -l
>    4343
> 
> any wisdom as to what this M$ noise is ? and what (else) to do about it?
> if anything ...

There is currently a similar thread on "mailop" mailing list about
connections from MS to *submission* ports, that connect, do valid AUTH
(using proper credentials!) and then hang up.

People in that thread suspect that this behavior might be associated with
connections from Outlook mobile app being proxied by MS servers. Probably
something went wrong there.

No definite conclusion yet.
-- 
Regards,
   Jaroslaw Rafa
   r...@rafa.eu.org
--
"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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