Date: 12-04-02 21:06
My email gateway... for work.
At work they (not we) use exchange, but the email gateway (since you don't want to put an NT box right on the internet) is FreeBSD 2.2.8. The machine;
2x fpx NICs
This machine relays about 40000 emails a day bewteen the internet and exchange and has done so for years. Its current uptime is over 700 days.