Paul Schmehl via Postfix-users:
> I?m trying to sort out a problem with Roundcube failing to send email with an
> error message that says SMTP Error(): authentication failed. In the roundcube
> error log I find this:
>
> [16-Jun-2024 13:58:24 -0500]: <5s9tomcd> PHP Error: SMTP server does not
> support authentication (POST
> /webmail/?_task=mail&_unlock=loading1718564304121&_framed=1&_action=send)
> [16-Jun-2024 13:58:24 -0500]: <5s9tomcd> SMTP Error: Authentication failure:
> mail.stovebolt.com <http://mail.stovebolt.com/>
Look in Your logs.
- Did the client connect to port 25 or 578?
- Did the client send starttls? That is logged in the "disconnect
from" line.
Do you have any "smtpd_tls_auth_only=yes" override in effect?
For main.cf:
postconf -n smtpd_tls_auth_only
For master.cf:
postconf -P '*/*/smtpd_tls_auth_only'
If that is set to 'yes', Postfix will ananounce AUTH only after
the client sends STARTTLS.
Wietse
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