mailer.rb

require 'tmail'
require 'postmark'

module Mailer
  class PostmarkTransport
    attr_accessor :content_type

    def initialize(api_key)
      Postmark.api_key= api_key
    end

    def send_message(from, to, subject, body)
      raise ArgumentError if to.empty? or from.empty? or subject.empty? or body.empty?

      message               = TMail::Mail.new
      message.from          = from
      message.to            = to
      message.subject       = subject
      message.content_type  = content_type
      message.body          = body

      yield(message) if block_given?

#Postmark.send_through_postmark(message)
    end

    private
    def content_type
      @content_type ||= 'text/html'
    end
  end
end