What is a physical mail API and how does it work?

What is a physical mail API and how does it work?

A physical mail API lets you send letters, postcards, or checks programmatically – no manual file uploads, batching, or print queues required. Think of it like an email API, but for real-world mail.

It connects your internal systems to a mail platform so you can send, personalize, and track physical mail at scale directly from your existing workflow.

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Step 1: Connect

Developers use the API to link internal systems, like a CRM, billing platform, or marketing tool, to a mail provider. That connection allows data to flow in real time, without manual exports or uploads.

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Step 2: Create the Request

Each API request includes essential info: recipient address, mail type (like postcard or letter), and the content or template to be printed. Many APIs support dynamic fields, so every piece can be personalized automatically.

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Step 3: Send

Once the request is submitted, the platform handles the rest – printing, postage, and delivery. Some APIs even include tracking so you can monitor progress like you would with a package or email.

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You can learn more about implementing a physical mail API here.