The \address
specifies the return address of a letter, as it
should appear on the letter and the envelope. Separate lines of the
address should be separated by \\
commands.
If you do not make an \address
declaration, then the letter
will be formatted for copying onto your organisation's standard
letterhead. (See Overview, for details on your local
implementation). If you give an \address
declaration, then the
letter will be formatted as a personal letter.