VestaCP – Fix Webmail Roundcube File Not Found Error | Fix Smtp Error 451 And Smtp Error 550

VestaCP – Fix Webmail Roundcube File Not Found Error
cd /etc/roundcubemail

edit config.inc.php
nano config.inc.php

//$config[‘skin'] = ‘larry'; remove or commant this
$config[‘skin'] = ‘elastic'; add this

—smtp error 451 vestacp–

wget https://git.io/JJjHP -O exim-4.93-3.el7.x86_64.rpm
rpm -Uvh –oldpackage exim-4.93-3.el7.x86_64.rpm

smtp error 550

1) Open your file: config.inc.php
Path:
CODE: SELECT ALL

/etc/roundcubemail/config.inc.php
2) Add a line:
CODE: SELECT ALL

$config[‘smtp_helo_host'] = ‘localhost';
3) Save/Exit and Reload exim, dovecot, spamassassin , clamd

Webmail Roundcube – Key Takeaways

To get Webmail Roundcube working properly, follow each step in the guide above in order. If something doesn't work, revisit the prerequisites and try again. For reference, see the official Webmail Roundcube documentation.

Related Guides

• How to Install hestiacp on Debian
• How To Install Moodle on AApanel
• How to Install Cyberpanel on Ubuntu

Key Takeaways

• This guide covered VestaCP Roundcube step by step, from prerequisites to verification.
• Always test changes on a staging server before applying them in production.
• Keep backups of your configuration files so you can roll back quickly if needed.
• For related tutorials, see our other guides on email servers and VPS management.

Troubleshooting Tips

If you run into issues while VestaCP Roundcube, check the system logs first — most errors leave a clear trace in /var/log/. Make sure all required packages are installed and your firewall allows the necessary ports. Restarting the relevant service often resolves transient failures. If a step fails consistently, verify file permissions and ownership, as incorrect permissions are a common cause of silent failures on Linux servers.

Frequently Asked Questions

Do I need root access? Yes, most server administration tasks require root or sudo privileges.

Will this work on other Linux distributions? The concepts apply broadly, though exact commands and file paths may differ between distributions.

How do I verify it worked? Follow the verification steps in the guide above and check the service status with systemctl status.