Viktor Dukhovni <postfix-us...@dukhovni.org> writes:

>> On Feb 3, 2018, at 1:21 PM, Karol Augustin <ka...@augustin.pl> wrote:
>> 
>> I have few people connecting using Macs. I had similar issue when I
>> upgraded libssl to 1.1.0f-4 all of them couldn't connect as they are
>> still using TLS 1.0. I had to temporarily downgrade to 1.1.0f-3 until
>> the problem was fixed in 1.1.0g-1. The problem was that developers
>> decided to disable TLS1.0, which impacted a lot of things.
>
> This is not consistent with the OP's logs for the failed session:
>
> Jan 29 16:44:57 fbsd63 postfix/smtpd[93113]: connect from 
> unknown[118.174.201.202]
> Jan 29 16:44:57 fbsd63 postfix/smtpd[93113]: Anonymous TLS connection 
> established from unknown[118.174.201.202]: TLSv1.2 with cipher 
> ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
> Jan 29 16:44:59 fbsd63 postfix/smtpd[93113]: warning: 
> unknown[118.174.201.202]: SASL PLAIN authentication failed: 
> Jan 29 16:45:05 fbsd63 postfix/smtpd[93113]: warning: 
> unknown[118.174.201.202]: SASL PLAIN authentication failed: 
> Jan 29 16:45:11 fbsd63 postfix/smtpd[93113]: warning: 
> unknown[118.174.201.202]: SASL PLAIN authentication failed: 
> Jan 29 16:45:21 fbsd63 postfix/smtpd[93113]: warning: 
> unknown[118.174.201.202]: SASL PLAIN authentication failed: Connection lost 
> to authentication server
>
> TLS is set up just fine.  What's failing is SASL.  Perhaps there are
> different authentication settings on port 587 than on 25, and remaking
> the email account has the effect of switching the submission port?
>
> Other factors to consider:
>
>    http://www.postfix.org/postconf.5.html#smtpd_sasl_local_domain
>    http://www.postfix.org/postconf.5.html#smtpd_sasl_security_options

Both are left to the default (empty) on the old and new server.

Thank you,

Olivier

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