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An EPM binds a digital file, email, or transaction to a trusted time source using hashing and public-key cryptography. This process creates an immutable audit trail that can prove a document has not been altered or tampered with since the timestamp occurred. This digital evolution ensures that the core security function of Henry Bishop's 1661 invention remains intact in our paperless future.
Keywords used: postmark, USPS postmark, hand-cancel postmark, legal postmark date, philately postmark, direct mail postmark. postmark
Applied exclusively on the exact day a new stamp is released to the public.
When Great Britain introduced the Penny Black—the world's first adhesive postage stamp—in 1840, the postmark evolved. Post offices needed a way to mar the stamp so people could not peel it off and use it again. Early cancellations used red or black ink in Maltese Cross designs. I can provide the exact details you need for your situation
Postmark's primary selling point is its industry-leading deliverability. As of 2025, the service boasts an average delivery time of just and a 99%+ inbox placement rate . This is achieved through a combination of hardened infrastructure, close relationships with email providers, and a strict policy against bulk marketing emails. By 2025, Postmark automatically enforces key email authentication standards like SPF, DKIM, and DMARC, giving users an automatic edge in maintaining a good sender reputation. For developers, it offers features like detailed 45-day activity logs, bounce handling, and comprehensive webhooks for real-time event tracking. The API can be used via its REST endpoints or through official libraries for Python, .NET, and other languages.
We talk a lot about marketing emails. Newsletters, drip campaigns, and abandoned cart sequences get all the glory (and all the A/B testing). This digital evolution ensures that the core security
Email is simple in concept but fiendishly complex in practice. For product teams, marketers, and developers building user-facing systems, reliable email delivery—deliverability—is often the difference between a smooth user experience and a support headache. Postmark is one of the email delivery services that focuses squarely on transactional email and deliverability; this post examines what makes a deliverability-first service valuable and how teams can use Postmark effectively.
You can set up webhooks to notify your app about events:
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