Hiya Dan,
That would be a hosting thing, not a website thing. If you're talking about S-Drive hosted sites, there isn't plans for that at all as far as I recall. Those that have asked about it in the past were pretty much told go get a business address setup with Gmail (don't recall what thread it was in, but there's a long discussion about it and someone (Kim maybe?) posted a nice instruction setup on how to do it.
If you aren't using S-Drive you will need to discuss email situations with your website hosting company.