Configure mailgun and mailer settings, awaiting DNS authentication

app/mailers/application_mailer.rb

@@ -1,4 +1,4 @@
 class ApplicationMailer < ActionMailer::Base
-  default from: "from@example.com"
+  default from: "no-reply@ateam.zone"
   layout 'mailer'
 end

app/mailers/invite_mailer.rb

@@ -1,6 +1,6 @@
 class InviteMailer < ApplicationMailer
 
   def invitation_email email
-    mail(to: email, subject: "Your Äteam Invitation")
+    mail(to: email, subject: "Your Ateam Invitation")
   end
 end

config/environments/development.rb

@@ -15,6 +15,16 @@
 
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
+  config.action_mailer.delivery_method = :smtp
+  config.action_mailer.default_options = {from: 'no-reply@ateam.zone'}
+  config.action_mailer.smtp_settings = {
+    :port           => ENV['MAILGUN_SMTP_PORT'],
+    :address        => ENV['MAILGUN_SMTP_SERVER'],
+    :user_name      => ENV['MAILGUN_SMTP_LOGIN'],
+    :password       => ENV['MAILGUN_SMTP_PASSWORD'],
+    :domain         => 'ateam.zone',
+    :authentication => :plain,
+  }
 
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log