The methods you are using are for traditional ASP.NET membership, not SimpleMembership. Here is the way to get that information from SimpleMembership.
var user = context.UserProfiles.SingleOrDefault(u => u.UserName == username);
var email = user.Email;
You can read more about accessing and customizing UserProfile here.
There is also an article on setting up password reset for SimpleMembership here and the source code is available here.