If you are lucky (fast) to get one of the first raspberry PIs, you could host your own mail server on one of those. Put SpamAssasin on there, get ssh running and the other mail programms you need (plenty of guides on the web for that), set up a rsync script for backup and then it's pretty much set & forget. Then when the SD card dies on you, you stick a new one in and resync, ta-da!