Hi
Sorry I have only just seen this
Firstly kitz is on a vps with a static IP, so not shared, however, it could be the sending server used maybe shared, but expect it is same vps sending emails
A check on kitz and forum.kitz shows some blacklisting, but nothing which should cause a failure, apart from oceprotect, which I woudl be surprised if MS started using them as an srbl
I would be tempted to send emails out as plain text as it could be code is triggering the block
Kitz, my offer of sending MS emails through our mail gateway still stands and I will check a little more later tonight or tommorow
Many thanks
John