j-a4

# Validates that MX record exists for domain to prevent typos and also block by MX servers
# Use by adding to app/models/user.rb
#   validates_with EmailMXValidator, if: :email_changed?

# frozen_string_literal: true
require 'resolv'
class EmailMXValidator < ActiveModel::Validator
  def validate(user)
    domain = user.email.split('@', 2).last
    mxs = Resolv::DNS.new.getresources(domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }