A return address
This item is the postal address of the author of the letter. Each line of it is
left justified -- either at a tab stop that puts the information toward the right
side of the page or at the left margin. Normally the return address is at the
top of the page, but you can move it down a little to improve over-all
appearance. Do not put email addresses here -- if you need to convey an
email address, do it in the body of the letter.