Direct answer: Get the USPS record your notice needs by picking Certified Mail or Certificate of Mailing on the proof, then approving, and we print and mail it. Certified Mail is an extra-cost USPS service with a tracking number. Certificate of Mailing is USPS evidence that the piece was mailed, with no tracking.
Letters starting at $1.15, postage included. For a one-page, single-sided, black-and-white First-Class letter.