Postmark Account-level API

postmarkapp · Communication

Communication No Auth Free & Open email

Postmark makes sending and receiving email incredibly easy. The Account-level API allows users to configure all Servers, Domains, and Sender Signatures associated with an Account.

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

GET List Domains

List Domains

https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/domains?count=10&offset=0

Hover any highlighted part to learn what it does

Headers — extra info sent with the request

X-Postmark-Account-Token

example

curl -X GET "https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/domains?count=10&offset=0" \
  -H "X-Postmark-Account-Token: example"

import requests
params = {
    "count": "10",
    "offset": "0"
}
headers = {
    "X-Postmark-Account-Token": "example"
}
response = requests.get(
    "https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/domains",
    params=params,
    headers=headers,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/domains');
url.searchParams.set('count', '10');
url.searchParams.set('offset', '0');

const response = await fetch(url, {
  headers: {
    'X-Postmark-Account-Token': 'example'
  },
}); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	baseURL, _ := url.Parse("https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/domains")
	q := baseURL.Query()
	q.Set("count", "10")
	q.Set("offset", "0")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("GET", targetURL, nil)
	req.Header.Set("X-Postmark-Account-Token", "example")

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/domains")
uri.query = URI.encode_www_form({
  "count" => "10",
  "offset" => "0"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)
req["X-Postmark-Account-Token"] = "example"

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/domains?" . http_build_query([
    "count" => "10",
    "offset" => "0"
]);
$opts = ["http" => [
    "method" => "GET",
    "header" => implode("\r\n", [
        "X-Postmark-Account-Token: example"
    ]),
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET List Sender Signatures

List Sender Signatures

https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/senders?count=10&offset=0

Hover any highlighted part to learn what it does

Headers — extra info sent with the request

X-Postmark-Account-Token

example

curl -X GET "https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/senders?count=10&offset=0" \
  -H "X-Postmark-Account-Token: example"

import requests
params = {
    "count": "10",
    "offset": "0"
}
headers = {
    "X-Postmark-Account-Token": "example"
}
response = requests.get(
    "https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/senders",
    params=params,
    headers=headers,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/senders');
url.searchParams.set('count', '10');
url.searchParams.set('offset', '0');

const response = await fetch(url, {
  headers: {
    'X-Postmark-Account-Token': 'example'
  },
}); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	baseURL, _ := url.Parse("https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/senders")
	q := baseURL.Query()
	q.Set("count", "10")
	q.Set("offset", "0")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("GET", targetURL, nil)
	req.Header.Set("X-Postmark-Account-Token", "example")

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/senders")
uri.query = URI.encode_www_form({
  "count" => "10",
  "offset" => "0"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)
req["X-Postmark-Account-Token"] = "example"

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/senders?" . http_build_query([
    "count" => "10",
    "offset" => "0"
]);
$opts = ["http" => [
    "method" => "GET",
    "header" => implode("\r\n", [
        "X-Postmark-Account-Token: example"
    ]),
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET List servers

List servers

https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/servers?name=test&count=10&offset=0

Hover any highlighted part to learn what it does

Headers — extra info sent with the request

X-Postmark-Account-Token

example

curl -X GET "https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/servers?name=test&count=10&offset=0" \
  -H "X-Postmark-Account-Token: example"

import requests
params = {
    "name": "test",
    "count": "10",
    "offset": "0"
}
headers = {
    "X-Postmark-Account-Token": "example"
}
response = requests.get(
    "https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/servers",
    params=params,
    headers=headers,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/servers');
url.searchParams.set('name', 'test');
url.searchParams.set('count', '10');
url.searchParams.set('offset', '0');

const response = await fetch(url, {
  headers: {
    'X-Postmark-Account-Token': 'example'
  },
}); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	baseURL, _ := url.Parse("https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/servers")
	q := baseURL.Query()
	q.Set("name", "test")
	q.Set("count", "10")
	q.Set("offset", "0")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("GET", targetURL, nil)
	req.Header.Set("X-Postmark-Account-Token", "example")

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/servers")
uri.query = URI.encode_www_form({
  "name" => "test",
  "count" => "10",
  "offset" => "0"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)
req["X-Postmark-Account-Token"] = "example"

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/postmarkapp.com/account/0.9.0/servers?" . http_build_query([
    "name" => "test",
    "count" => "10",
    "offset" => "0"
]);
$opts = ["http" => [
    "method" => "GET",
    "header" => implode("\r\n", [
        "X-Postmark-Account-Token: example"
    ]),
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗

See official documentation for authentication and setup.

What can you build with Postmark Account-level API?

Postmark Account-level API is a Communication API. Developers commonly use communication APIs for:

sending SMS alerts and notifications
building in-app chat and messaging features
automating email sequences and transactional emails
creating voice bots and IVR systems
verifying phone numbers at signup

No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. Postmark Account-level API is free to use, making it a low-risk choice to experiment with.

New to APIs? Read our beginner's guide

Open documentation ↗