Some of this depends on how much one has to put on a page.Originally Posted by pcmpage
A short letter usually gets more spacing to help it fill a page. A long letter might get less to save having a few lines on a second page.
date and name/address 1-2
name/address and salutation 1-2
salutation and letter body 1
letter body and closing 1-3
closing and sender name 1-3