MS SQL Server select from Sub Table

DECLARE @table1 TABLE
    (
      MailServerID INT NULL ,
      MailServer VARCHAR(100) ,
      EmailAddress VARCHAR(100)
    );

INSERT  INTO @table1
        ( MailServerID, MailServer, EmailAddress )
VALUES  ( 1, -- ID - int
          'server1',  -- MailServerID - int
          'test@server1.com' ),
        ( 2, -- ID - int
          'server2',  -- MailServerID - int
          'test@server2.com' );

DECLARE @table2 TABLE
    (
      ID INT IDENTITY(1, 1) ,
      MailServerID INT ,
      EmailAddress VARCHAR(100)
    );

INSERT  INTO @table2
        ( MailServerID, EmailAddress )
VALUES  ( 2,  -- MailServerID - int
          'test@serversubtable_100.com' ),
        ( 2,  -- MailServerID - int
          'test@serversubtable_200.com.com' );

DECLARE @MailServerID INT;
SET @MailServerID = 2;

DECLARE @ID INT;
SET @ID = 1;
--If I set @ID = 4 nothing comes back when it should return test@server2.com

SELECT  ISNULL(t2.EmailAddress, t1.EmailAddress) EmailAddress
FROM    @table1 t1
        LEFT JOIN @table2 t2 ON t1.MailServerID = t2.MailServerID
WHERE   t1.MailServerID = @MailServerID
        AND @ID = t2.ID;