SMTP error roundcube dovecot-impersonate

drlight17

Hello.
I’ve just faced a problem using admin roundcube login functionality (based on the instruction). I can login to RC under every mailcow user, but I can’t send email. Errors:

[11-Feb-2022 09:28:47 +0300]: <587b6897> PHP Error: Invalid response code received from server (POST /rc/?_task=mail&_unlock=loading1644560924762&_framed=1&_action=send)
[11-Feb-2022 09:28:47 +0300]: <587b6897> SMTP Error: Authentication failure: Invalid response code received from server (Code: 535) in /web/rc/program/lib/Roundcube/rcube.php on line 1774 (POST /rc/?_task=mail&_unlock=loading1644560924762&_framed=1&_action=send)

Is this only me faced this problem or is this a known bug or is this by design behavior?

drlight17

For someone, who is interested: I’ve managed it to work using smtps instead of starttls with the following paramatres in RC config.inc.php:

$config['smtp_server'] = 'ssl://postfix';
$config['smtp_port'] =465;
$config['smtp_auth_type'] = 'LOGIN';
$config['smtp_user'] = '';

$config[‘smtp_pass’] should be '' or not specified at all.
It’s a workaround but it works so it fits my needs.