A letter that says only certified mail

Here is a sample letter that says "Only Certified Mail":

[Your Name] [Your Address] [City, State, ZIP] [Email Address] [Phone Number] [Date]

[Recipient's Name] [Recipient's Address] [City, State, ZIP]

Dear [Recipient's Name],

This letter is being sent to you via certified mail, return receipt requested. Please note that it is only being sent via certified mail and will not be accepted by the recipient if it is not signed for and returned to the sender.

Sincerely,

[Your Signature] [Your Name]

Certified Mail Number: [Insert Certified Mail Number]

Return Receipt Requested

Please note that this is just a sample, and you should adjust the language and details to fit your specific needs.