I have just set up an Exchange server on NT running MS proxy 2. I have configured the exchange server to listen on port 25 on the external network card. I have also created a MX record on our Primary DNS server also running on the same mahcine. However I am having problems receiving mail from the internet. I can send mail fine just can't receive. If i send to a recepient on the exchange server from say my hotmail account I get nothing. No NDRs nothing. If I send a message from our exchange server to hotmail then reply to it I get the message but in a weird way. It shows up in my inbox as an attachment to a message from UUNET's mailer-daemon. The message from uunet says unauthorized relay request. How is UUNET getting my smtp mail. They are our service provider but we run all of our own equipment with the exception of the leased dsl line from them. Is is possible that they are filtering incoming smtp packets on the block of IP addresses that we received from them. I can't figure this one out. It is making me crazy.
Any light you could shed on the subject would be great. Thank You.