When someone uses their ISP as an EMail source ... if you discontinue service, or if you move and change ISP providers ... your EMail goes PooF !
You should always use a reputable EMail source like Yahoo EMail
Your username and password should always be the same, globally (except for online banking and such) then you will always remember your UN & PW
Your UN & PW should be written down on a piece of masking tape on the box that your Trainz version came in, or handwritten down in a paper log book