In Umbraco v8.1.5

Whatever i seem to try it doesn't work to find a Member's email address

I have created 2 MemberTypes "Owner" and "Student" each containing their respective fields, i am also using ModelsBuilder

i have a list with all the members the list contains IPublishedContent types or i just take the currentuser

var member = Umbraco.MembershipHelper.GetCurrentMember();

This retrieved member (when logged in) is of a ....DOMAIN.Models.Owner

In umbraco on the Members tab i can add a Login and an Email address but somehow i don't seem to be able to retrieve this in the backend.

i've tried several method's

var mail = member.Email;

but the property is not existing on the member type.

var mail = member.GetProperty("Email").Value<string>();

this is returning an empty string

var mailProperty = member.GetProperty("Email");
var mailText = mailProperty.Value<string>();

The property is found, but its value seems an empty string.

What is the proper way to retrieve the Member's core properties?