There were two kinds of documentary forms, more specifically one which used respectful words in writing the name of the addressee and ending the letter, and a normal letter which did not use respectful words.
文型としては宛所（宛先）と書止めがそれぞれ「某とのへ・也」とより丁寧な表現の「某殿・也、状如件」の2形式が存在した。