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

>> On Feb 2, 2018, at 12:03 AM, Olivier <olivier.nic...@cs.ait.ac.th> wrote:
>> 
>> I apologize for being abiguous. It is a problem of authentication to
>> SMTP (they have no problem with IMAP). And the certificate has not
>> changed (same machine, same name, same file); and cyrus saslauthd has
>> not changed either.
>
> And you're also not posting the relevant logs because you'll get more
> "inspired" suggestions if everyone has to guess the cause?  Right? :-)

The log are below.

> You've also not explained what you mean by deleting and recreating the
> account.

I am not a Mac user, byt from the Mail app, select Files/Account and
remove the account that makes problem and recreate it the same.

> The only random guess that comes to mind is your SASL library may now
> claims to support OAUTH, but really does not.  Apple's Mail.app tends
> to be fond of that particular SASL mechanism.  Of course without logs
> that's just crazy wild speculation.

Thank you,

Olivier

A failing connection:AMTP authentication:
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
Jan 29 16:45:21 fbsd63 postfix/smtpd[93113]: disconnect from 
unknown[118.174.201.202] ehlo=2 starttls=1 auth=0/4 quit=1 commands=4/8


A successful SMTP authentication with same credentionls but from a
different Mac:

Jan 30 17:52:38 fbsd63 postfix/smtpd[15674]: connect from 
Mac-4.desktops.cs.ait.ac.th[192.41.170.243]
Jan 30 17:52:38 fbsd63 postfix/smtpd[15674]: Anonymous TLS connection 
established from mac-4.desktops.cs.ait.ac.th[192.41.170.243]: TLSv1.2 with 
cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)

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