Certificate of Mailing provides proof of the date a package was mailed.

Second, he said, once a landlord has failed to cash one rent check, subsequent checks should be sent either by certified mail or with a certificate of mailing.

Other suggestions include centralized reporting of violations to detect problem-prone people, requiring servers to obtain a certificate of mailing when sending a document by mail and requiring government authorization for duplicating notary seals.

Most USPS extra services, such as Certified Mail, registered mail, delivery confirmation, insured mail, certificate of mailing, return receipt, restricted delivery and return receipt for merchandise are available to the MPS.

So, Mr. Zingman said, while a certificate of mailing proves only that the tenant sent an envelope to the landlord through the Postal Service, not that the landlord received a rent check, it at least shows a court that the Postal Service was given something to deliver to the landlord's mailbox.