How do you write a certified letter?

You write your letter as usual, then mail it Certified, at a US Post Office. Be certain, though, as you would for any business or legal matter, that your letter contains the name and address of both yourself and recipient, and is dated. You do not mark the letter itself "Certified," although you may note in the body text that you are mailing the letter Certified. Seal and address your letter as usual. At the Post Office, obtain and fill out a Certified Mail form. You likely also want to use a Return Receipt form. Your cost at the window will be the postage cost of sending your letter (which must be sent either First-Class Mail or Priority Mail), plus the Certified Mail fee of $2.65, plus a Return Receipt fee, if you desire this service, of $0.85 for email confirmation or $2.15 for confirmation by mail. These are the costs in effect at this time, June of 2007.