Another Windows Live service shipped this week, http://domains.live.com. From the site

Already own your own Internet domain name?

Have us host e-mail and IM for you in a domain you already own.

Create up to 20 e-mail accounts within your domain

Get a 250 MB inbox for each account*

Check your e-mail from any Web-enabled PC

Junk e-mail filter protection using Microsoft SmartScreen technology

Virus scanning and cleaning of e-mail

Seamless access with MSN Messenger, MSN Spaces, etc.

This is a pretty cool service and one I've been wanting for a while. Now I can provide @25hoursaday.com email addresses for myself and others without actually having to host a mail server. Sign me up, baby.