I’m seeing this error in the roundcube logs:

[16-Jun-2024 20:28:58 -0500]: <n142glqv> SMTP Error: Authentication failure: 
mail.stovebolt.com
PIPELINING
SIZE 900000000
VRFY
ETRN
STARTTLS
ENHANCEDSTATUSCODES
8BITMIME
DSN
SMTPUTF8
CHUNKING (Code: 250) in /var/www/html/webmail/program/lib/Roundcube/rcube.php 
on line 1794 (POST 
/webmail/?_task=mail&_unlock=loading1718587737852&_framed=1&_action=send)
[16-Jun-2024 20:34:16 -0500]: <n142glqv> PHP Error: SMTP server does not 
support authentication (POST 
/webmail/?_task=mail&_unlock=loading1718588056454&_framed=1&_action=send)
[16-Jun-2024 20:34:16 -0500]: <n142glqv> SMTP Error: Authentication failure: 
mail.stovebolt.com
PIPELINING
SIZE 900000000
VRFY
ETRN
STARTTLS
ENHANCEDSTATUSCODES
8BITMIME
DSN
SMTPUTF8
CHUNKING (Code: 250) in /var/www/html/webmail/program/lib/Roundcube/rcube.php 
on line 1794 (POST 
/webmail/?_task=mail&_unlock=loading1718588056454&_framed=1&_action=send)

The odd thing is, I don’t see any connection attempts at all in the mail logs. 
However, this log entry has me wondering. PHP Error: SMTP server does not 
support authentication

Should postfix be announcing that it accepts AUTH LOGIN? If so, I may have 
missed something in the config. I’m wondering if roundcube is not even attempt 
auth because postfix isn’t announcing it as a service that it offers.

Paul Schmehl
paul.schm...@gmail.com



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