The file squirrelmail-splash-rhel.png must be removed or replaced. The image states "powered by Red Hat Enterprise Linux and Squirrelmail", but the EPEL package is designed for use on non-RHEL systems as well as RHEL systems. This change must be made in all EPEL squirrelmail packages distributed by Fedora.
squirrelmail-1.4.22-3.el6 has been submitted as an update for Fedora EPEL 6. https://admin.fedoraproject.org/updates/squirrelmail-1.4.22-3.el6
Package squirrelmail-1.4.22-3.el6: * should fix your issue, * was pushed to the Fedora EPEL 6 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=epel-testing squirrelmail-1.4.22-3.el6' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-EPEL-2012-12951/squirrelmail-1.4.22-3.el6 then log in and leave karma (feedback).
squirrelmail-1.4.22-3.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.