We used to use horde to provide our webmail service, but redhat now provides squirrelmail for this purpose. So, installed the package with up2date:

up2date squirrelmail

This also installed package: php-mbstring

Instructions are to restart httpd and go to http:///webmail. Unfortunately, this doesn’t let me log in. Problem has to do with our only allowing imaps connections and not imap connections. To fix this, go to:

/usr/share/squirrelmail/config and run:

./conf.php

Then go through and change the settings to match our site. After changing everything, I was allowed to log in.