Postmark Official

Ink lines or bars that strike the postage stamp to prevent reuse Types of Postmarks Automated (Machine) Postmarks:

Historically, postmarks were applied by hand using metal or rubber ink stamps. Today, high-speed automated sorting machines process the vast majority of mail, applying printed digital cancellations at speeds of tens of thousands of letters per hour. The Legal and Financial Importance of the Postmark

The physical postmark was invented in London during the 1660s by Henry Bishop, the English Postmaster General. Initially called the "Bishop Mark," it was created to answer public complaints about delayed mail delivery. By stamping the day and month onto a letter, the postmaster could track exactly how long a courier took to deliver it.

[ Henry Bishop's Invention: 1661 ] │ ▼ [ The "Bishop Mark" (Month & Day Only) ] │ ▼ [ Introduction of Adhesive Stamps: 1840 ] │ ▼ [ Duplex Stamps (Postmark + Killer Bar) ] The Bishop Mark

[Mailing Dropped Off] ──> [Processing Facility] ──> [Mechanical/Manual Postmark Applied] ──> [Legal Proof of Date]

The history of the postmark is a fascinating narrative of postal reform and the fight against corruption. The story begins in 1661 in England. Henry Bishop, the English Postmaster General, grew frustrated with postal carriers who were intentionally delaying mail to extort higher fees from recipients. To stamp out this practice, he introduced the “Bishop Mark,” a simple circular hand-stamp that recorded only the day and month of mailing. This proved that a letter had been entered into the system on a specific date, allowing patrons to hold carriers accountable for timely delivery. This was the world’s first official postmark.

In today's digital age, the role of postmarks might seem diminished. However, they still serve a critical function:

Have you ever had a customer claim they "never got the email"? With Postmark's Activity Feed, you can see exactly what happened to every single message. Did the ISP accept it? Opened: Did the user actually see it? Bounced: Was the email address invalid?

The name of the processing facility or the city, state, and ZIP code of the retail unit that applied the marking

Beyond the software product, the term "electronic postmark" refers to a secure cryptographic timestamp. Organizations like the Universal Postal Union (UPU) define standards for these digital stamps. They provide non-repudiation, meaning a sender cannot deny sending a document, and a recipient cannot deny receiving it at a specific time. Security Components

If you'd like, I can provide a for a specific language or help you set up a webhook handler for bounce notifications. Which part Getting started with Postmark