Can you send emails from custom email addresses from other domains? I have a whole slew of domain names and use lots of different email addresses all the time. If I signed up for .mac, I wouldn't ever want to use the firstname.lastname@example.org email address. Its kind of a deal breaker if they don't do it and I'd be very surprised if they don't since Yahoo's Mail Pro service does let you do that and is a fraction of the price. I'd really like .mac for the syncing alone.