This is probably not directly related to IronPort, but I'm sure you guys might be able to help.
We installed an IronPort applicane a few months ago and everything works great. Unfortunately, we forward the mails to our internal sendmail server which has to be reachable from the Internet for some legacy stuff. The sendmail box in conjunction with IronPort (smarthost) seems to enable source routing of email addresses, rendering the box an open relay.
Is there a way to drop all source routed e-mails at sendmail? Based on what I read, IronPort does drop source routed e-mails anyway.