Usps Form 3817 - Certificate of mailing service provides a postmarked. When purchased at the time of mailing with certified mail, cod, insurance (for more than $200), or registered mail. Use a certificate of mailing. Do you need evidence to show that your letter or package was mailed? This certificate of mailing provides evidence that mail has been presented to usps® for mailing. Web access the most often used business mailer forms here. Web form 3818 by mail only.
Do you need evidence to show that your letter or package was mailed? When purchased at the time of mailing with certified mail, cod, insurance (for more than $200), or registered mail. Certificate of mailing service provides a postmarked. This certificate of mailing provides evidence that mail has been presented to usps® for mailing. Web access the most often used business mailer forms here. Use a certificate of mailing. Web form 3818 by mail only.