Add mailtrap.io SMTP settings

app/mailers/user_mailer.rb

@@ -0,0 +1,3 @@
+class UserMailer < ActionMailer::Base
+  default from: "from@example.com"
+end

config/initializers/smtp_settings.rb

@@ -0,0 +1,9 @@
+ActionMailer::Base.smtp_settings = {
+  :address           => 'mailtrap.io',
+  :port              => 2525,
+  :authentication    => :plain,
+  :user_name         => ENV['MAILTRAP_USERNAME'],
+  :password          => ENV['MAILTRAP_PASSWORD'],
+}
+
+ActionMailer::Base.delivery_method = :smtp

spec/mailers/user_mailer_spec.rb

@@ -0,0 +1,5 @@
+require "spec_helper"
+
+describe UserMailer do
+  pending "add some examples to (or delete) #{__FILE__}"
+end