Allow access to people only using a specific email address

Hi,

I may need to create a website that allows access from people ONLY from within their business. I'm thinking it's along the same lines as a membership site where only people using that business email address can register.

For example, only people with email addresses from ...@mybusiness.com, can register. Any other email address is barred.

Is this possible with Membership Pro plugin, or another WPMU plugin? Or any other plugin?

Thanks.

Robin