I use it for my personal domain name. It's basically gmail, only you're using it
with your domain name instead of gmail's.
I recognize the fact they can do anything with my email as they wish, even
discontinue the free service anytime. But for now, it's suitable for my needs,
especially when my relatives and friends send me large attachments.
The only thing I don't like about gmail is they don't allow users to create their
own folders currently. I hope they'll allow this in the future so I can organize
my emails from my various online subscriptions.