Windows based SMTP server recs?

I need to host my own SMTP server since Comcast Business Workplace apparently can’t handle that (they don’t offer SMTP unless you’re using their Web hosting). So…this leaves me in a bind for when, for example, people are visiting and need to send outgoing mail and can’t because their own ISPs won’t relay.

Any suggestions for something easy and free?

I was going to say “MAC MINI!!!” until I saw the last word of your post. Now I’m going to say… didn’t Windows NT have one built in?

Yeah… for XP Pro: add/remove programs, windows components, IIS , Details…, SMTP service.

Yeah, just discovered WinXP Pro has SMTP Service built in – I’m rocking and rolling now, yay!