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Ps Form 3817. Do you need evidence to show that your letter or package was mailed? Web get extra protection for your special envelopes or packages.
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Use a certificate of mailing. Web access the most often used business mailer forms here. Do you need evidence to show that your letter or package was mailed? Learn about the insurance and extra services we offer:. Certificate of mailing service provides a postmarked. Use a certificate of mailing. Web get extra protection for your special envelopes or packages. This certificate of mailing provides evidence that mail has been presented to usps® for mailing.
