require 'mail' module ActiveModel module Validations class EmailValidator < EachValidator def validate_each(record, attribute, value) # takes from: https://github.com/hallelujah/valid_email begin mail = Mail::Address.new(value) # We must check that value contains a domain and that value is an email address valid = mail.domain && value.include?(mail.address) if options[:only_address] # We need to dig into treetop # A valid domain must have dot_atom_text elements size > 1 # user@localhost is excluded # treetop must respond to domain # We exclude valid email values like # Hence we use m.__send__(tree).domain tree = mail.__send__(:tree) valid &&= (tree.domain.dot_atom_text.elements.size > 1) else valid &&= (mail.domain.split('.').length > 1) end rescue Exception => e valid = false end record.errors.add attribute, (options[:message]) unless valid end end end end