Searches in Roundcube do not return any messages

Symptoms

When searching in Roundcube, nothing is shown, and a small red error appears after some time.

Description

Roundcube reads the Dovecot index files when it searches emails. The issue commonly occurs when the index files have become corrupt.

Workaround

1. Access the server's command line as the 'root' user via SSH or "Terminal" in WHM.
2. Rebuild the index files:
   • For all email accounts under a cPanel account

     /usr/local/cpanel/scripts/remove_dovecot_index_files --user $cpuser 

     Please note that "$cpuser" must be replaced with the cPanel user's username.
   • For a single email account

     doveadm index -v -u $username@domain.tld INBOX

     Please note that "$username@domain.tld" must be replaced with the user's email address.
3. Run the following command if Dovecot-Solr is running on the server.

   /usr/local/cpanel/scripts/rescan_user_dovecot_fts --user $cpuser

   Please note that "$cpuser" must be replaced with the cPanel user's username.
4. Restart Dovecot:

   /scripts/restarstsrv_dovecot