email_validator

email_validator.rb

class EmailValidator < ActiveModel::EachValidator
  require 'resolv'

  def validate_each(record, attribute, value)
    unless value =~ /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i
      record.errors[attribute] << (options[:message] || I18n.t('email.wrong'))
    end

    split_email = value.split("@")
    domain      = split_email[1].to_s
    Resolv::DNS.open do |dns|
      @mx = dns.getresources(domain, Resolv::DNS::Resource::IN::MX)
    end
    if @mx.blank?
      record.errors[attribute] << (options[:message] || I18n.t('email.wrong_domain'))
    end
  end

end