Auth_imp: Required IMAP extension not found

[jominj]

Plesk gives following error for horde

Auth_imp: Required IMAP extension not found.

It requires IMAP module of php to be installed on the server.

To install the php-imap do the following

1) download and install repository
wget -q -O - http://www.atomicorp.com/installers/atomic | sh

2) check the version of php
If php has latest version then install the imap with following command
yum install php-imap
If php has older versions then compatible modules is to be installed.

3) restart httpd
/etc/init.d/httpd restart

4) restart plesk
/etc/init.d/psa restart