gistfile1.rb

class User < ActiveRecord::Base

  validates_uniqueness_of :email, :case_sensitive => false
  validate :valid_email?

  
private

  def valid_email?
    address = EmailVeracity::Address.new(email)
    
    unless address.valid?
      errors.add( :email, address.errors.join(", ") )
    end
  end

end