# File lib/rmail/address.rb, line 52
    def <=>(other)
      if !other.kind_of?(RMail::Address)
        other = RMail::Address.new(other.to_str)
      end
      cmp = (@local || '') <=> (other.local || '')
      if cmp == 0
        cmp = (@domain || '') <=> (other.domain || '')
      end
      return cmp
    end