Solved DirectAdmin 1.676 - Roundcube SMTP Incorrect authentication data

[webunity]

GM, i updated DA, ran into the dovecot plugin issue, fixed that. I am now able to login to roundcube (latest version) again; but when trying to send an email i get an SMTP error.

SMTP Error (): Authentication failed.

I have checked my RC configuration and i am using the following settings over there:

$config['smtp_server'] = '%t';
$config['smtp_port'] = 587;
$config['smtp_user'] = '%u';
$config['smtp_pass'] = '%p';

It seems i am already using the right settings, but i am not sure; i see this in the logs when i get the error:

2025-06-26 11:39:14 login authenticator failed for (localhost) [81.30.107.29]: 535 Incorrect authentication data (set_id=act)

 

[webunity]

edit & update: i changed

$config['smtp_server'] = '%t';

to

$config['smtp_server'] = 'tls://%t';

and it started working.