Official integration library for using Rails and ActionMailer with the Postmark HTTP API
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postmark-rails gem

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The Postmark Rails Gem is a drop-in plug-in for ActionMailer to send emails via Postmark, an email delivery service for web apps. The gem has been created for fast implementation and fully supports all of Postmark’s features.

Supported Rails Versions

  • Rails 5.0
  • Rails 4.x
  • Rails 3.x

For Rails 2.3 please take a look at version 0.4. It may miss some new features, but receives all required bug fixes and other support if needed.

Configuring your Rails application

Add postmark-rails to your Gemfile (change version numbers if needed) and run bundle install.

gem 'postmark-rails', '~> 0.15.0'

Save your Postmark API token to config/secrets.yml.

postmark_api_token: "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Set Postmark as your preferred mail delivery method via config/application.rb:

config.action_mailer.delivery_method = :postmark
config.action_mailer.postmark_settings = { :api_token => Rails.application.secrets.postmark_api_token }

Note: The postmark_settings hash can contain any options supported by Postmark::ApiClient.

Tracking opens and tagging your deliveries

You can use tags to categorize outgoing messages and attach application-specific information. Tagging the different types of email that you send lets you review statistics and bounce reports separately.

Pass :track_opens => 'true' to enable/disable open tracking on per-message basis. Check out the Triggers API to see how Postmark can help you control this with tags. Note that we pass a string here, since it becomes a header value. Passing a boolean may or may not work depending on your Rails version.

class TestMailer < ActionMailer::Base

  def tagged_message
      :subject => 'hello',
      :to      => '',
      :from    => '',
      :tag     => 'my-tag',
      :track_opens => 'true'


Sending attachments

You can also send file attachments with Postmark. Read our Developer docs for additional information.

The Postmark gem is compatible with ActionMailer attachments API. It allows you to specify the name, content-type and other attributes for your attachments.

The legacy :postmark_attachments attribute is no longer supported on Rails 3.2.13 and above.

class TestMailer < ActionMailer::Base

  def message_with_attachment
    attachments.inline['logo.png'] ="/path/to/image") # Inline image
    attachments['42.jpg'] ="/path/to/file") # Attached file
      :subject              => 'hello',
      :to                   => '',
      :from                 => ''


Sending in batches

While Postmark is focused on transactional email, we understand that developers with higher volumes or processing time constraints need to send their messages in batches. To facilitate this we provide a batching endpoint that permits you to send up to 500 well-formed Postmark messages in a single API call.

client ='your-api-token')

messages = []
messages << DigestMailer.weekly_digest(@user1)
messages << DigestMailer.weekly_digest(@user2)


# => true

# => true

Additional information

Looking for the advanced usage examples? Check out the documentation for the postmark gem. The postmark-rails gem is built on top of it, so you can benefit from all its features.


  • postmark gem version 1.0 and higher is required.
  • You will also need a Postmark account, a server and at least one sender signature set up to use it. To get an account, sign up!

Note on Patches/Pull Requests

  • Fork the project.
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so we don’t break it in a future version unintentionally.
  • Commit, do not mess with rakefile, version, or history.
  • Send a pull request. Bonus points for topic branches.

Authors & Contributors

  • Artem Chistyakov
  • Petyo Ivanov
  • Ilya Sabanin
  • Hristo Deshev
  • Randy Schmidt
  • Chris Williams
  • Nicolás Sanguinetti
  • Laust Rud Jacobsen (rud)


Copyright © 2010—2013 Wildbit LLC. See LICENSE for details.