How can I customize Devise to send password reset emails using PostMark mailer

I'm trying to get all of my system's email notifications under one umbrella using PostMarkApp and utilizing the Rails gems (postmark-rails, postmark-gem, and mail). I have successfully created a mailer that handles sending receipts for purchases but I haven't been able to receive emails for forgotten passwords. My development logs show that Devise sent the message but no email is received in my inbox and the PostMark credits are not decremented.

What's the best or easiest way to have Devise's mailers send through my PostMark account?

Snippet from config/environments/development.rb

config.action_mailer.delivery_method      = :postmark
config.action_mailer.postmark_settings    = { :api_key => "VALID_API_KEY_WAS_HERE" }
config.postmark_signature                 = VALID_POSTMARK_SIGNATURE_WAS_HERE

My Mailer that uses Postmark

class Notifier < ActionMailer::Base
  # set some sensible defaults
  default :from => MyApp::Application.config.postmark_signature

  def receipt_message(order)
    @order = order
    @billing_address = order.convert_billing_address_to_hash(order.billing_address)

    mail(:to => @order.user.email, :subject => "Your Order Receipt", :tag => 'order-receipt', :content_type => "text/html") do |format|
      format.html
    end
  end
end

EDIT: SOLUTION to my question is below

Solved it by having my Notifier mailer extend Devise::Mailer and specifying Devise to use my Notifier as the mailer within config/initializers/devise.rb

snippet from config/initializers/devise.rb

# Configure the class responsible to send e-mails.
config.mailer =