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This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...
Tracking numbers are useful for knowing the location of time sensitive deliveries. It is a unique ID number or code assigned to a package or parcel. The tracking number is typically printed on the shipping label as a bar code that can be scanned by anyone with a bar code reader or smartphone.
The UPU S10 standard defines a system for assigning 13-character identifiers to international postal items for the purpose of tracking and tracing them during shipping. The standard was introduced on 18 April 1996, [ 1 ] : 4 and is currently in its 12th version.
Although the SMTP is a mature technology, counting more than thirty years, its architecture is increasingly strained by both normal and unsolicited load. [2] The email systems have been enhanced with reputation systems tied to the actual sender of the email, with the idea of recipient's email servers rejecting the email when a forged sender is used in the protocol.
In most cases, this means that the address is deliverable. However, if the USPS has the address listed as "VACANT", it is not delivered, even though the address is valid. Note: An address can still be valid (but not deliverable by the USPS) if it is a remote location and only served by private carrier such as UPS or Fedex. [citation needed]
Issuance of a DSN upon delivery failure is the default behavior, whereas issuance of a DSN upon successful delivery requires a specific request from the sender. However, for various reasons, it is possible for a message to be delivered, and a DSN is returned to the sender indicating successful delivery, but the message subsequently fails to be ...
Package tracking or package logging is the process of localizing shipping containers, mail and parcel post at different points of time during sorting, warehousing, and package delivery to verify their provenance and to predict and aid delivery. Package tracking developed historically because it provided customers information about the route of ...
Package notifications do not include images, only information on the delivery status of the package. U.S. Postal Inspection Service (USPIS): Mail is protected by the USPIS, whose purpose is to safeguard the U.S. Postal Service system, including the employees who deliver and process the mail and millions of customers who use it.