Roundcube-Horde-Squirrelmail

In the digital era, seamless email functionality is essential for maintaining efficient business communications. Unfortunately, issues with email delivery, such as emails not sending or receiving, can significantly disrupt operations. This post delves into common problems experienced with cPanel's email services and provides a comprehensive guide to troubleshooting and resolving these issues. Whether you're a system administrator or a cPanel user, understanding how to address these challenges swiftly and effectively is crucial to minimize downtime and maintain robust communication channels

1. Verify Roundcube Configuration:Edit the Configuration:Open the main Roundcube configuration file

vi /usr/local/cpanel/base/3rdparty/roundcube/config/main.inc.php

Locate the line $rcmail_config['smtp_user'] = '%u'; and change it to

$rcmail_config['smtp_user'] = '';

2. Check CSF Configuration:Edit CSF Configuration:Check the CSF (ConfigServer Security & Firewall) configuration file for the following entries

SMTP_BLOCK = "1" SMTP_ALLOWLOCAL = "1"

If the value of SMTP_BLOCK is 0, change it to 1 and restart CSF.

3. Update cPanel:Upgrade cPanel:To update cPanel to the latest stable version,

/scripts/upcp --force

4. Increase PHP Memory Limit:Edit php.ini:Increase the memory_limit in the PHP configuration file located at

/usr/local/cpanel/base/3rdparty/roundcube/php.ini

5. Reinstall Roundcube:Update Roundcube Installation:Follow these steps to update and reset Roundcube

/usr/local/cpanel/bin/update-roundcube --force

If needed, manually reinstall Roundcube

/usr/local/cpanel/install/webmail /usr/local/cpanel/bin/update-roundcube

6. Reset the Roundcube Database:Rebuild the Roundcube Database:Drop and recreate the database

mysql -u root -p -e "DROP DATABASE roundcube; CREATE DATABASE roundcube;"

Restore the Roundcube database schema

mysql -u root -p roundcube < /usr/local/cpanel/base/3rdparty/roundcube/SQL/mysql.initial.sql

7. Update Database Credentials:Edit Database Configuration:Open db.inc.php to check and update the database connection details

vi /usr/local/cpanel/base/3rdparty/roundcube/config/db.inc.php

Ensure it contains the correct database credentials

mysql://root:YOUR_ROOT_PASSWORD@localhost/roundcube

8. Repair Roundcube Tables:Use phpMyAdmin:In phpMyAdmin, select the Roundcube database and repair all tables.

9. Reset MySQL Root Password:Update MySQL Credentials:Use WHM to reset the MySQL root password to ensure the configuration is accurate.

10. Full Horde Reset:Reset Horde:To reset the Horde webmail application:bash

/scripts/fullhordereset

Repair the Horde session handler table

mysql -u root -p horde -e "REPAIR TABLE horde_sessionhandler;"

11. Update Horde and SquirrelMail:Update Horde

/usr/local/cpanel/bin/update-horde --force

Update SquirrelMail

/usr/local/cpanel/bin/update-squirrelmail --force

Resolving email delivery issues in cPanel can seem daunting, but with the right approach, it is manageable. By systematically troubleshooting, from verifying configuration files to resetting key components, you can restore email functionality and ensure that your communication systems run smoothly. The steps outlined here serve as a blueprint to tackle common email problems in cPanel. Remember, regular maintenance and updates are key to preventing such issues from arising in the first place, keeping your email systems operational and your business communications uninterrupted.