Weird one I haven't seen before.
User reported they're unable to email Started doing some tests, etc.. tried to telnet to on port 25 and timed out. This was tried from my GWIA box running on Oes2. I then tried to telnet from my windows machine and connected successfully. Found this odd, so looked at my firewall (sonicwall pro 230) logs and when I attempt on linux, it says "malformed IP packet dropped".. this is obviously why we can't email their domain, but I have no idea what would cause this. I'm able to telnet on port 25 to any other domain MX (yahoo, etc).

Any ideas here? lost.