Add ApplicationMailer

app/mailers/application_mailer.rb

+class ApplicationMailer < ActionMailer::Base
+  default from: "\"#{AppConfig.settings.pod_name}\" <#{AppConfig.mail.sender_address}>"
+end

app/mailers/diaspora_devise_mailer.rb

 class DiasporaDeviseMailer < Devise::Mailer
-  default :from => AppConfig.mail.sender_address
+  default from: "\"#{AppConfig.settings.pod_name}\" <#{AppConfig.mail.sender_address}>"
 
   def self.mailer_name
     "devise/mailer"

app/mailers/export_mailer.rb

-class ExportMailer < ActionMailer::Base
-  default from: AppConfig.mail.sender_address
-
+class ExportMailer < ApplicationMailer
   def export_complete_for(user)
     @user = user
 

app/mailers/maintenance.rb

-class Maintenance < ActionMailer::Base
-  default :from => AppConfig.mail.sender_address
-
+class Maintenance < ApplicationMailer
   def account_removal_warning(user)
     @user = user
     @login_url  = new_user_session_url

app/mailers/notifier.rb

-class Notifier < ActionMailer::Base
+class Notifier < ApplicationMailer
   helper :application
   helper :notifier
   helper :people

app/mailers/report_mailer.rb

-class ReportMailer < ActionMailer::Base
-  default from: "\"#{AppConfig.settings.pod_name}\" <#{AppConfig.mail.sender_address}>"
-
+class ReportMailer < ApplicationMailer
   def self.new_report(report_id)
     report = Report.find_by_id(report_id)
     Role.moderators.map {|role| super(report.item_type, report.item_id, report.text, role) }