Add support of punycode domains in emails

app/models/concerns/email_verifable.rb

@@ -3,21 +3,54 @@ module Concerns
     extend ActiveSupport::Concern
 
     def email_verification
-      EmailAddressVerification.find_or_create_by(email: email.downcase,
-                                                 domain: domain(email.downcase))
+      EmailAddressVerification.find_or_create_by(email: self.class.punycode_to_unicode(email),
+                                                 domain: domain(email))
     end
 
     def billing_email_verification
       return unless attribute_names.include?('billing_email')
 
-      EmailAddressVerification.find_or_create_by(email: billing_email.downcase,
-                                                 domain: domain(email.downcase))
+      EmailAddressVerification.find_or_create_by(email: self.class
+                                                            .punycode_to_unicode(billing_email),
+                                                 domain: domain(billing_email))
+    end
+
+    class_methods do
+      def domain(email)
+        Mail::Address.new(email).domain&.downcase || 'not_found'
+      rescue Mail::Field::IncompleteParseError
+        'not_found'
+      end
+
+      def local(email)
+        Mail::Address.new(email).local&.downcase || email
+      rescue Mail::Field::IncompleteParseError
+        email
+      end
+
+      def punycode_to_unicode(email)
+        return email if domain(email) == 'not_found'
+
+        local = local(email)
+        domain = SimpleIDN.to_unicode(domain(email))
+        "#{local}@#{domain}"&.downcase
+      end
+
+      def unicode_to_punycode(email)
+        return email if domain(email) == 'not_found'
+
+        local = local(email)
+        domain = SimpleIDN.to_ascii(domain(email))
+        "#{local}@#{domain}"&.downcase
+      end
     end
 
     def domain(email)
-      Mail::Address.new(email).domain || 'not_found'
-    rescue Mail::Field::IncompleteParseError
-      'not_found'
+      SimpleIDN.to_unicode(self.class.domain(email))
+    end
+
+    def punycode_to_unicode(email)
+      self.class.punycode_to_unicode(email)
     end
 
     def verify_email_mx_smtp(field:, email:)

app/models/email_address_verification.rb

@@ -39,8 +39,7 @@ class EmailAddressVerification < ApplicationRecord
   end
 
   def verify
-    # media = success ? :mx : :smtp
-    media = :regex
+    media = :mx
     validation_request = Truemail.validate(email, with: media)
 
     if validation_request.result.success