Fix typo in mail defaults

app/mailers/admins_mailer.rb

 class AdminsMailer < ApplicationMailer
-  ADMINS_EMAIL = "backoffice@facem.com"
+  ADMINS_EMAIL = "backoffice@facem.at"
 
   def account_created(user)
     @user = user

app/mailers/application_mailer.rb

 class ApplicationMailer < ActionMailer::Base
-  default from: "backoffice@facem.com"
+  default from: "backoffice@facem.at"
 
   layout "mailer"
 end