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Whether you are looking at a physical stamp on a vintage letter or utilizing the Postmark API to power your startup’s notifications, the goal is the same—ensuring a message gets where it needs to go, exactly when it needs to be there. For businesses that value their relationship with their users, choosing a high-delivery service like Postmark isn't just a technical decision; it's a customer service one. js or ?

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These are the printed labels you get when buying postage at a post office counter. They are considered the functional equivalent of a postmark Pictorial and Slogan Postmarks: Whether you are looking at a physical stamp

Furthermore, electronic postmarks (EPMs) are emerging as a digital alternative. An EPM is an encrypted timestamp attached to a digital file or email, providing mathematical proof of the exact moment a document was sent, ensuring data integrity in paperless environments. This public link is valid for 7 days

A standard modern postmark contains highly specific data points arranged for quick human and machine readability.

The Evolution of the Postmark: From Ink Stamps to Digital Sovereignty