> On Feb 6, 2018, at 1:26 AM, Olivier <olivier.nic...@cs.ait.ac.th> wrote:
>
>> 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.
If recreating the account on the client side resolves the issue, and
successful authentication is PLAIN, but what was failing before the
account reset was also PLAIN, then the only conclusion is that the
client settings were wrong. Whether the incorrect setting was the
username, the password, the port, ... hard to say. What is clear
is that there's no Postfix issue, since merely recreating the login
on the MUA end is sufficient.
Good luck.
--
--
Viktor.
