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.
Connect everything. Deploy nothing.
No credit card required.