RoundCube SMTP error (454)

[jfeuzeu]

SYSTEM INFORMATION
Ubuntu 20.04:	REQUIRED
Webmin 1.981:	REQUIRED
Virtualmin 6.17-3:	REQUIRED
RoundCube 1.5.1:	RECOMMENDED

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Hello,
For some reasons I cannot send out emails from RoundCube, I’m getting this error “SMTP error (454): Authentication failed.” at each attempt.
However, I’m able to receive emails.
Thanks for the inputs on how to fix this.

[calport]

What does the log file say?

Also see

Smtp error (454) authentication failed

Well, @mantas8 and I worked on this and the issue is now resolved. I had to do the following to resolve the issue: create a subdomain, vps.domain.tld, for hostname of server Virtualmin was running on change the hostname from the default that Contabo sets to vps.domain.tld create subdomains for name servers Rerun Post-Install Wizard and apply name servers Request SSL certificate for vps.domain.tld and apply to webmin / usermin / postfix / dovecot et al. Install Roundcube Troubleshoot SASL (as …

[jfeuzeu]

@calport

What does the log file say?

This is all I can see for today:
[Thu Dec 16 02:25:29.586607 2021] [authz_core:error] [pid 1557627:tid 139907611748096] [client 195.54.160.149:58704] AH01630: client denied by server configuration: /home/sibhe/public_html/vendor/phpunit
[Thu Dec 16 03:09:44.972954 2021] [authz_core:error] [pid 1557628:tid 139908116752128] [client 18.118.164.146:54380] AH01630: client denied by server configuration: /home/sibhe/public_html/.env
[Thu Dec 16 03:52:26.541792 2021] [authz_core:error] [pid 1557627:tid 139907016161024] [client 45.61.146.242:49926] AH01630: client denied by server configuration: /home/sibhe/public_html/.env

Apparently, there is not error for that in “Apache Error Log”.

[jotst]

Did you check mail sending with usermin also?

https://yourserver:20000

And or same smtp user connect in a apllication on that box, as example a cms, or webshop…
Also smtp connect with a mailclient

So you can be sure it is smtp or roundcube-virtualminbox related

[jfeuzeu]

I found the issue and will document it here for those who might have the same issue.

From your file manager, go to roundcube/config/config.inc.php and remove the default SMTP user and password.
From

$ config['smtp_user'] = '%u';
$ config['smtp_pass'] = '%p';

to

$ config['smtp_user'] ='';
$ config['smtp_pass'] = '';