Using EXCEPT and DISTINCT in SQL Server

I'm trying to figure out if any users in this table have multiple email addresses.

When I run the following two queries, the non-DISTINCT query has more results than the one using DISTINCT.

SELECT UserName, EmailAddress 
FROM Users;

SELECT DISTINCT UserName, EmailAddress 
FROM Users;

However, this query does not return any results (presumably since the remaining rows would be identical to one which is in both tables).

SELECT UserName, Payment 
FROM Users

EXCEPT

SELECT DISTINCT UserName, Payment 
FROM Users

How can I get the users with multiple email addresses?