RSA 305-A:6 Service of Process; How Made.

I. Service of process in any suit, action, or proceeding or service of any notice or demand required or permitted by law to be served on a foreign partnership may be made on such partnership by service thereof on a registered agent of such partnership. Service of any such process or of any such notice or demand upon a registered agent as registered agent may be made:
(a) By leaving an attested copy of such process, notice, or demand in the registered office of the registered agent during regular business hours; or
(b) A foreign partnership may be served by registered or certified mail, return receipt requested, addressed to the secretary of the foreign partnership at its principal office shown in its application for a certificate of authority, if the foreign partnership: