>> Anyways, the isp I am currently using has limited the ability to pick
>> a dns of your own chooice since it uses the dns as a messaging =

>> for its customers.=20

> What you describe here looks more like an http redirect and not a DNS=20
> thing. It should not effect your mail server...

Also could be a quarentine situation, where your machine gets put on a =
"special network" until the you acknowledge the message.