Supporting Multiple SMTP Servers in Rails

postmarker.rb

module Postmarker

  def postmark_mail(*args)

    mail_message = mail(*args)
    
   if can_use_postmark?(mail_message.From.to_s) 

     mail_message.delivery_method.settings.merge!(
        :address => 'smtp.postmarkapp.com', 
        :user_name => ENV['POSTMARK_API_KEY'],
        :password => ENV['POSTMARK_API_KEY'], 
        :port => 2525, 
        :authentication => 'plain', 
        :enable_starttls_auto => true, 
        :domain => 'kickofflabs.com')

    end

    mail_message
  end

  def can_use_postmark?(from_address)
    ENV['POSTMARK_API_KEY'] && Rails.env.production? && valid_address?(from_address)
  end

  def valid_address?(from_address)
    %w{[email protected] [email protected]}.include?(from_address)
  end
end