When I try to add an email address to Facebook, it says 'invalid'. But it's not!
Unfortunately, we don't support email addresses with generic prefixes like info@, webmaster@, etc. Since email addresses of this nature are typically used for organizations and businesses, we don't allow them to be used for personal Facebook accounts. Please try signing up again using another address that you own.
Of course they should have explained this when you tried your info@ email address. Bad UX.