How To Write A Letter Of Service To A Sorority Is There An Online Service Where I Can Write A Letter Online And Have It Mailed To A Regular USPS Address?

Is there an online service where I can write a letter online and have it mailed to a regular USPS address? - how to write a letter of service to a sorority

Is there an online service where you save a document online (how to write e-mail), and were sent to an address by USPS regular mail? (Or, alternatively, in a letter by fax to fax anyone?)