A few days ago I was introduced to the magical world of Winlink. Winlink works no different than APRS, other than the fact that it forwards your messages, either through the internet or via radio relay. It's good to have in case you lose internet and/or cell phone service, and messages pass along relatively fast.
The best thing about Winlink is that you can send it to an outside domain, it doesn't have to be a winlink.org domain. I can send emails perfectly (via telnet and HF) to my personal account. Unfortunately, because Winlink has to follow FCC laws, emails sent from Winlink are NOT encrypted, so don't send passwords, social security numbers, or medical stuff... you get the point.