(arrows mean you have to leave a line,)
(make it in four/ three lines, both the addresses. e.g
P.S: if writing from a company/group, write the office address
To, (the designation of the person whom you are writing the letter)
Subject: (it is generally given in the question and make it brief)
(your intro eg. I am XYZ from so and so ) and i may like throw ight on the topic/ make a complain/ (anything else as per the the question)
THE BODY IS OF 3 PARAGRAPHS (max)
(Last line) i.e I am sure you will take a look at the matter.
Designation (if from a commitee)
Sender's address (four/three lines)
May this letter find you in pink of health.
(min. 2 para. max. 3 para)
(Last line) Convey my warm regards to Uncle/Aunty/Mom/Dad/Grandpa/Grandma
Yours Lovingly/Truly (or you can use Truly Yours)
Note: Make the informal letter little personal. Add your feelings.