Set up DMARC and see who's sending email using your brand's domain.

Reliable email delivery for your web projects

Easily manage multiple clients, let them keep their brand, and get complete insights into delivery.


Manage multiple clients from a single account

Use Postmark servers to organize your email sending into logical groups based on the project, client, or environment. Control who can access each server using our detailed user permissions.

Servers screenshot
Organize your sending into logical groups using Postmark servers.
User permissions screenshot
Advanced user permissions allow you to control who can access what.
Two-factor Authentication screenshot
Two-factor authentication helps to keep your account secure.
Activity Icon

Complete insight into your clients’ sending

Get full visibility into your clients’ sending with 45 days of email history as standard (customizable from 0 to 365 days), including open and click tracking to measure how users engage with your emails.

Activity screenshot showing filter tools
Search, filter, and view up to 365 days of detailed message activity from the activity feed.
Message events screenshot
Detailed message event logs for every email.
Message HTML and plain text preview screenshot
Full HTML and plain text content for every message you send.

Start sending in minutes

With API libraries for pretty much every programming language you can think of, Postmark fits seamlessly into any stack.

// Send an email with the Postmark-PHP library
// Learn more ->

// Install with composer
composer require wildbit/postmark-php

// Import
use Postmark\PostmarkClient;

// Example request
$client = new PostmarkClient("server token");

$sendResult = $client->sendEmail(
  "Hello from Postmark!",
  "This is just a friendly 'hello' from your friends at Postmark."

# Send an email with the Postmark Ruby Gem
# Learn more ->

# Add the Postmark Ruby Gem to your Gemfile
gem 'postmark'

# Require gem
require 'postmark'

# Create an instance of Postmark::ApiClient

# Example request
  from: '',
  to: '',
  subject: 'Hello from Postmark',
  html_body: '<strong>Hello</strong> dear Postmark user.',
  track_opens: true

# Send an email with the Postmark Rails Gem
# Learn more ->

# Add this to your gemfile
gem 'postmark-rails'

# Add this to your config/application.rb file:
config.action_mailer.delivery_method = :postmark
config.action_mailer.postmark_settings = { :api_token => "POSTMARK_API_TEST" }

# Send the email
class TestMailer < ActionMailer::Base
  def hello
      :subject => 'Hello from Postmark',
      :to  => '',
      :from => '',
      :html_body => '<strong>Hello</strong> dear Postmark user.',
      :track_opens => 'true'

# Send an email with the Postmark Python library
# Learn more ->

# Install the Postmark Python library with pip from the command line:
pip install postmarker

# Import
from postmarker.core import PostmarkClient

# Create an instance of the Postmark client
postmark = PostmarkClient(server_token='POSTMARK-SERVER-API-TOKEN-HERE')

# Send an email
  Subject='Postmark test',
  HtmlBody='HTML body goes here'

// Send an email with the Postmark .NET library
// Learn more ->

// Install with NuGet
PM> Install-Package Postmark

// Import
using PostmarkDotNet;

// Example request
PostmarkMessage message = new PostmarkMessage {
    From = "",
    To = "",
    Subject = "Hello from Postmark",
    HtmlBody = "<strong>Hello</strong> dear Postmark user.",
    TextBody = "Hello dear postmark user.",
    ReplyTo = "",
    TrackOpens = true,
    Headers = new NameValueCollection {{ "CUSTOM-HEADER", "value" }}

PostmarkClient client = new PostmarkClient("POSTMARK_API_TEST");

PostmarkResponse response = client.SendMessage(message);

if(response.Status != PostmarkStatus.Success) {
    Console.WriteLine("Response was: " + response.Message);

// Send an email with the Postmark.js library
// Learn more ->

// Install with npm
npm install postmark --save

// Require
var postmark = require("postmark");

// Example request
var client = new postmark.ServerClient("server token");

    "From": "",
    "To": "",
    "Subject": "Test",
    "TextBody": "Hello from Postmark!"

# Send an email with curl
# Copy and paste this into terminal

curl "" \
  -X POST \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -H "X-Postmark-Server-Token: POSTMARK_API_TEST" \
  -d "{From: '', To: '', Subject: 'Hello from Postmark', HtmlBody: '<strong>Hello</strong> dear Postmark user.'}"

Switching to Postmark?

Check out our handy migration guides

Official API libraries for all your favorite languages and frameworks.

  • Abdullah Al-hennawy Abdullah
  • Anita Pericic Anita
  • Anna Ward Anna
  • Brian Kerr Brian
  • Dana Chaby Dana
  • Fionnuala Walls Fionnuala
  • Ignacio Roig Ignacio
  • Jordan Dibb Jordan
  • Natalie Keshlear Natalie
  • Natalie Robles Natalie
  • Shelley Jeżewska Shelley

Meet our knowledgeable support team

Email is complicated. Our customer success team are always on hand to help you get set up, investigate bounce reports, or answer any other questions you have.

Customer Happiness Rating
  • 😃 Great (96%)
  • 🙂 Okay (1%)
  • 😔 Not Good (3%)

Customer feedback gathered through Help Scout over the past 60 days.

Delivery Speed

Fast & reliable email delivery

Reaching the inbox isn’t enough. Your clients’ customers expect transactional emails to arrive immediately—not eventually. Which is why we constantly monitor our delivery speeds and publish the data publicly on our status page for everyone to see.

  • Gmail

  • Apple

  • Hotmail

  • AOL

  • Yahoo

Time to Inbox data updated every 5 minutes

Secure and GDPR friendly

We’re committed to keeping your data safe and protecting the privacy of your clients’ users.

We have worked hard to meet our obligations as a processor under Article 28 of GDPR and are certified under the EU-U.S. and Swiss-U.S. Privacy Shield frameworks.

Read what we’ve done to comply with GDPR →
GDPR friendly
Stack of emails with Postmark ribbon

Simple monthly plans

Control whether your clients can access billing settings with detailed user permissions.

Emails per month
Monthly price
Additional emails

Need more emails?

Get in touch to discuss our high-volume tiers.

What’s your monthly email volume?

Tell us how many emails your application sends and receives each month and we’ll find the best tier for you

Three stacks of envelopes
Optional add-ons

Dedicated IPs

Starts at $50/month per IP

Our fully managed dedicated IPs are available to customers sending 300,000 emails per month or more.

Learn more →

DMARC Monitoring

Starts at $14/month per domain

Fix authentication issues that prevent your email from reaching the inbox and see who’s sending using your domain with DMARC Digests.

Learn more →

Custom activity retention

Starts at $5/month

Customize how long Postmark will store activity data and message content for your emails. Statistics are always kept indefinitely.

Learn more →

Postmark has been incredibly easy to use, is unfailingly fast and reliable, and the Wildbit team is always around for fast, efficient help.

Mike Riess

Mike Riess

Owner at Riess Group

Setting up was a breeze, the clean and easy to learn UI was enjoyable, and the confidence knowing that web form submission made it to the client? Priceless.

Luke Hatfield

Luke Hatfield

Web Developer at Visual Dialogue

We rely on Postmark’s high-quality sender reputation. This allowed us to ramp up our outbound volume quickly while we migrated from another provider.

Matthew Hutchinson

Matthew Hutchinson

Senior Developer at FreeAgent

The best email provider for web agencies

Join thousands of companies that already trust their email delivery to Postmark.