Email and messaging

Connect Postmark

Your application calls one EchoRelay URL. When Postmark changes its API, you update the mapping, not your application.

How Postmark signs requests

A server token in the X-Postmark-Server-Token header for sending. Account-level calls use an account token in X-Postmark-Account-Token.

Can you connect it today?

Yes. Add an API-key-in-a-header credential with the header name X-Postmark-Server-Token.

A sample mapping

Your application sends the first request below. The mapping turns it into the body of POST /email, shown second.

Your request

{
    "from": "orders@shop.example",
    "to": "ana@example.com",
    "subject": "Your order has shipped",
    "text": "Order 1042 is on its way."
}

What Postmark receives

{
    "From": "orders@shop.example",
    "To": "ana@example.com",
    "Subject": "Your order has shipped",
    "TextBody": "Order 1042 is on its way."
}

The mapping

{
    "$schema": "https://schemas.echorelay.dev/transform/mapping/v1.json",
    "root": {
        "type": "object",
        "id": "root",
        "properties": {
            "From": {
                "type": "field",
                "id": "from",
                "path": "from"
            },
            "To": {
                "type": "field",
                "id": "to",
                "path": "to"
            },
            "Subject": {
                "type": "field",
                "id": "subject",
                "path": "subject"
            },
            "TextBody": {
                "type": "field",
                "id": "text",
                "path": "text"
            }
        }
    }
}

The grammar, the answer mapping and the dry run are in the mapping docs.

What you bring

This is not a ready-made connector. You bring a sample request or Postmark’s OpenAPI document, you or your agent write the mapping, and we run the integration you define.

Postmark facts on this page were read 2026-10-29 from Postmark API overview, Postmark email API. Another service? Check it here.

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