can not send email - SMTP error on roundcube

[wolvepy]

Hi,
First: there's no or very little info about email server in Sentora documentation. Maybe becuz we can go directly to Dovecot, etc... to get support.

I'm using roundcube... I can loggin but when I press to send I get this error:
[img][/img]

Which means: An error has ocurred! Error SMTP (-1): Server connection has failed

I went to Admin > Sentora Config and I put by mistake something in SMTP Server field... I deleted and saved my change, but Sentora does not accept the change... it's still there what I wrote. Then I tried leaving in blank but is not taking the change. Is there any file where I can go set up this?

Then, I went to:
/etc/sentora/panel/etc/apps/webmail/config/config.inc.php
In SMTP server is written: 'localhost'... not the one I wrote.
Is this the correct file to set up email server config.?

I can not receive email as well.

Why Sentora is not getting my changes?