There are a few key things to remember when writing a formal letter:
-Address the letter to the appropriate recipient. If you do not know the name of the person you are writing to, you can use a general title such as "To Whom It May Concern."
-Use a formal tone throughout the letter. This means avoiding contractions (don't, can't, won't, etc.) and using full, proper names for people and places.
-Although you want to sound professional, avoid using overly technical language or jargon that the recipient may not understand.
-Be clear and concise in your writing. Get to the point quickly and without beating around the bush.
-End the letter with a courteous closing, such as "Sincerely" or "Best regards," followed by your signature and name.