RSA 458:11: Service on Correspondent.

Any person not a party to the proceedings who is accused of adultery with the petitionee in a petition or cross petition for divorce or petition or cross petition for legal separation shall be duly served seasonably with an attested copy of such petition with the usual order of notice. Such service shall not be required when it appears that the third party resides outside the state or when the third party has been convicted of adultery with the petitionee as charged in the petition. Such third party, regardless of residence, shall have the right to appear and be heard in the proceedings.