SMTP AUTH and ODMR Providers for Personal SMTP Service?

no_such_user asks: "After a few years of successfully running a personal mail server at home via my residential cable modem, some organizations (i.e. AOL) and spam filters are now denying SMTP connections originating from residential/dynamic networks. Additionally, my ISP will likely block incoming SMTP traffic at some point. While I applaud these attempts to fight spam, I enjoy the freedom I have running my own mail server, and don't want to switch to a mail hosting provider using POP/IMAP/Webmail. What I need is a provider which does both ODMR (on-demand mail routing) and SMTP AUTH. Unfortunately, the only provider I've found is outside my country (US) and is more expensive than I was hoping for. Without switching to 'business class' internet service, what are my alternatives so that I can continue to run my own mail server without spending a fortune? I don't mind being subject to reasonable daily transfer limits or speed limits to prove I'm not out to spam anyone. Perhaps these is something like a DynDNS service for mail? Or perhaps someone provides permanent IP addresses which I can add to my server via VPN?"