usage_of_postmark_api_in_ruby_on_rails.md

How to use Postmark API with MailPlugger in Ruby on Rails

Please note that these examples were not tested, but I believe it should work.

Let's use mailer method which was defined here.

Add postmark gem to the Gemfile.

gem 'postmark'

Then run bundle install command to deploy the gem.

Change the API and MailPlugger.plug_in method in config/initializers/mail_plugger.rb.

class PostmarkApiClient
  def initialize(options = {})
    @settings = { token: ENV['POSTMARK_TOKEN'] }
    @options = options
  end

  def deliver
    Postmark::ApiClient.new(@settings[:token]).deliver(generate_mail_hash)
  end

  private

  def generate_mail_hash
    {
      from: @options[:from].first,
      to: @options[:to],
      subject: @options[:subject],
      text_body: @options[:text_part],
      html_body: @options[:html_part],
      tag: @options[:tag]
    }
  end
end

MailPlugger.plug_in('postmark') do |api|
  api.client = PostmarkApiClient
  api.delivery_options = %i[from to subject text_part html_part tag]
  api.delivery_settings = { return_response: true }
end

Then modify the mailer method a little bit.

class TestMailer < ApplicationMailer
  default from: 'from@example.com'

  def send_test
    mail subject: 'Test email', to: 'to@example.com', delivery_system: 'postmark', tag: 'send_test'
  end
end