How to know default webmail client that user uses for email box Horde or Roundcube on a cPanel server

To check the default webmail client that a user uses for their email box on a cPanel server, you can use the following command:

egrep "roundcube|horde" /home/*/.cpanel/nvdata/*_default_webmail_app

It will show a user, email box and default webmail app that set up by the user by default

 … Read the rest

cPanel error. Horde is unavailable while the system is being upgraded. HTTP error 503

Make sure hostname is good:


Did you run /scripts/upcp –force? If not do it.

/scripts/upcp --force

If you run it already, run it again as I got this fixed after the second run.

If still not working:

cd /var/cpanel/.application-locks
rm -fv UpdateHostname\:USERNAME
/usr/local/cpanel/bin/update_horde_config --user=USERNAME

where USERNAME is cPanel username.… Read the rest

SMTP : Message size exceeds server limit

Check the message_size_limit value

exim -bP | grep message_size_limit

message_size_limit = 50M

Increase if needed in

Since recently:

Rebuild and restart exim:

service exim restart

If you’re still getting the problem please view the following explanation:

SMTP Error: Message size exceeds server limit


 … Read the rest

How to enable Inline HTML display in Horde

cPanel’s Horde has “Inline HTML” is disabled by default

The error you probably got:

This message part contains HTML data, but inline HTML display is disabled.
View HTML data in new window.
Convert HTML data to plain text and view in new window.
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How to enable Inline HTML message viewing for Horde.

By default HTML viewing message for Horde is disabled

To enable edit the following file


And change the following line


$mime_drivers['imp']['plain']['inline'] = false;


$mime_drivers['imp']['plain']['inline'] = true;

Syntaxis has been little bit changed, so now you need to update the following section in /usr/local/cpanel/base/horde/imp/config/mime_drivers.php… Read the rest

How to enable Spell Checker in Horde webmail

One of the many unique features about Horde webmail is it’s spell checker facility. However, the use of this requires that certain components be installed. To install these follow these instructions:

1) Login to your Linux box via SSH as root.… Read the rest