On Tue, Aug 15, 2023 at 04:14:58PM -0400, pgnd via Postfix-users wrote:
2023-08-14T13:11:53.782611-04:00 svr01 postfix/postscreen[27910]: CONNECT from 
[52.101.56.17]:32607 to [209.123.234.54]:25
2023-08-14T13:11:59.860098-04:00 svr01 postfix/postscreen[27910]: PASS NEW 
[52.101.56.17]:32607
2023-08-14T13:12:00.058029-04:00 svr01 
postfix/postscreen-internal/smtpd[27907]: connect from 
mail-eastus2azon11020017.outbound.protection.outlook.com[52.101.56.17]
2023-08-14T13:12:00.118201-04:00 svr01 
postfix/postscreen-internal/smtpd[27907]: Anonymous TLS connection established 
from mail-eastus2azon11020017.outbound.protection.outlook.com[52.101.56.17]: 
TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)
2023-08-14T13:12:00.131049-04:00 svr01 
postfix/postscreen-internal/smtpd[27907]: disconnect from 
mail-eastus2azon11020017.outbound.protection.outlook.com[52.101.56.17] ehlo=1 
starttls=1 quit=1 commands=3

On 15.08.23 17:12, Viktor Dukhovni via Postfix-users wrote:
Perhaps they don't like your certificate and disconnect once the
handshake completes.  What are some of the domains this server is an MX
host for?

I have certificate signed by my personal CA and receive mail from microsoft services w/o problems.

BTW I explicitly allow mail from their IP ranges at postscreen level:

#google
209.85.128.0/17         permit
74.125.0.0/16           permit
#outlook.com
40.92.0.0/15            permit
40.107.0.0/16           permit
52.100.0.0/14           permit
104.47.0.0/17           permit

they published some more ranges but when I checked, I haven't noticed mail from other than these ranges

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

Isn't that outbound mail *to* Microsoft-hosted domains?  I wouldn't
expect that to appear in logs of incoming mail.

correct

--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
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