def recipient_name=(v)
      @recipient_name = nil
      if (v = sanitize(v)) && v.length > 0
        @recipient_name = v
      else
        raise USPSValidationError, "'#{v}' is not a valid string in #{__method__}"
      end
    end
def recipient_name=(v)
      @recipient_name = nil
      if (v = sanitize(v)) && v.length > 0
        @recipient_name = v
      else
        raise USPSValidationError, "'#{v}' is not a valid string in #{__method__}"
      end
    end
The name in an email sent by the system containing the returns label attachment.
 <em>Optional</em>.