This seems like the best tutorial on the net! I've been pulling my hair out for days though. Took me forever to figure out my ISP blocks port 25!

I have a service with my dynamic DNS provider that should solve just this problem, an e-mail port forwarder. I can use a different port like 2525 or 26. Im not sure how to implement this with postfix. I have tried "relayhost = waterlowphotography.com:2525" But it doesnt seem to work. Does anyone know what I should do? I have started my install fresh and am now at the first "test" point after a simple server install.