app/controllers/concerns/email_methods.rb

   1 # frozen_string_literal: true
   2
   3 module EmailMethods
   4   extend ActiveSupport::Concern
   5
   6   private
   7
   8   def canonical_email(email)
   9     local_part, domain = email.split("@")
  10
  11     local_part.sub!(/\+.*$/, "")
  12
  13     local_part.delete!(".") if %w[gmail.com googlemail.com].include?(domain)
  14
  15     "#{local_part}@#{domain}"
  16   end
  17
  18   ##
  19   # get list of MX servers for a domains
  20   def domain_mx_servers(domain)
  21     Resolv::DNS.open do |dns|
  22       dns.getresources(domain, Resolv::DNS::Resource::IN::MX).collect { |mx| mx.exchange.to_s }
  23     end
  24   end
  25 end