Use cheap vps with static ip, it will be much easier. I doubt anyone keeps their mail server in home with dynamic ip.
Why should you doubt that, I've read many a blog where that is the case. A few also block any dsl ip even though there are far better ways of detecting spamming viruses which often connect from corporate networks anyway. If your provider blocks for this reason, they don't know what they are doing and you should change. Still, you can't fix the world in a day. Has your ISP refused a static IP? -- _______________________________________________________________________ 'Write programs that do one thing and do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface' (Doug McIlroy) _______________________________________________________________________