Currently I have an exchange server at my house. This pops my VPS every 15 min to retrieve me email. For outgoing I send it out my VPS mail server. But I have noticed I am getting flagged with a higher spam score while doing this. Customers are seeing my messages in their spam box. Even my own VPS flags it as SPAM when I email someone else on the server from my home exchange server. It appears that a reverse lookup fails because it is trying to a reverse lookup of the Private IP address of my mailserver at my house which is a 192.168 address.

Any advice on how to keep my exchange server at home but prevent myself form being marked as spam? My Blackjack syncs with my exnchange server while I am out and it comes in very good use.