So, we installed our new pfSense firewall last Friday, and with some massaging got it functioning with one fairly major exception: We cannot get to Webmail from inside the office.
Our webmail (Novell GroupWise) does a redirect to its outside address, so we get a 501 DNS_rebind attack message when we try to access it from the LAN.
Is this a problem that is fixable from the firewall? Or do I have to find some way to remove the redirect on the mail server (GroupWise is not my native email language...)