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

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?

> 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.

-- 
    Viktor.
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