Postmark

The name of the city, state/province, and specific postal facility.

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So the next time you drop a letter in the mailbox, look at the top right corner. That little smear of ink isn't just killing a stamp; it is sealing a moment in time. Protect it, read it, and appreciate it—before the digital tide washes it away entirely. postmark

Example (Node.js):

Before the introduction of adhesive postage stamps in the 1840s, letters were often marked with handstamps to show where they originated and how much postage was due. With the adoption of standardized postage (like the Penny Black in the UK), a mechanism was needed to ensure stamps could not be used twice. The name of the city, state/province, and specific

The secret sauce is their Human-First Review Process . Postmark manually reviews every new account to ensure they aren't spammers. While this might seem like a hurdle, it’s actually a massive benefit: it protects the IP reputation of the entire platform, ensuring your emails aren't caught in spam filters. Getting Started is Simple

In the legal world, the date on a postmark is king. The "Mailbox Rule" (common in contract law) states that a document is considered filed or accepted on the date it is , not the date the recipient receives it. If your tax return is due on April 15th, as long as the postmark on the envelope reads "April 15th" (or earlier), the IRS considers it on time—even if it arrives a week later. This single stamp prevents millions of dollars in late fees annually. So the next time you drop a letter

Are you asking because you have a coming up, or are you looking to integrate email into a project?

: You must prove you own the email address or domain you plan to send from. Sender Signature : Verifies a single email address.

: This consists of lines, bars, or a design drawn over the postage stamp. The primary purpose of the cancellation is to deface the stamp, preventing it from being reused.

Before the digital age, every letter was a physical object whose journey was documented with ink. This documentation came in the form of a , a broad category that includes postmarks, cancellations, and auxiliary marks. At its core, a postmark is a marking made on an envelope, parcel, or postcard that indicates the place, date, and time an item was accepted into a postal system.