So let's look at a few misconceptions. Often in understanding International Business you have to unlearn many things first, much of the information out there particularly is inaccurate or worse dangerously ambiguous.
At the end you should sign off with "sincerely yours" or any other related salutation. If you are applying for a particular job then you need to create letter of intent that contains the following. First of all mention your name, address and contact number.