An updated SquirrelMail package has been released for CentOS-3 x86_64
A new squirrelmail package is available for CentOS-3 x86_64. Refer to https://rhn.redhat.com/errata/RHSA-2004-654.html.
RPMS/squirrelmail-1.4.3a-7.EL3.centos.1.noarch.rpm
SRPMS/squirrelmail-1.4.3a-7.EL3.centos.1.src.rpm
Execute "yum update squirrelmail" to apply.