2019 New York Laws
CVP - Civil Practice Law and Rules
Article 3 - Jurisdiction and Service, Appearance and Choice of Court
R306 - Proof of Service.

Rule  306.  Proof  of service. (a) Generally.   Proof of service shall
specify the papers served, the person who was served and the date, time,
address, or, in the event there is  no  address,  place  and  manner  of
service,  and  set  forth  facts showing that the service was made by an
authorized person and in an authorized manner.
  (b) Personal service.  Whenever  service  is  made  pursuant  to  this
article  by  delivery  of the summons to an individual, proof of service
shall also include, in addition to any other requirement, a  description
of  the  person  to whom it was so delivered, including, but not limited
to, sex, color of skin, hair color, approximate age, approximate  weight
and height, and other identifying features.
  (c)  Other service. Where service is made pursuant to subdivision four
of section three hundred eight of this chapter, proof of  service  shall
also  specify  the  dates,  addresses and the times of attempted service
pursuant to subdivisions one, two or three of such section.
  (d) Form. Proof of service shall be in the form of  a  certificate  if
the  service is made by a sheriff or other authorized public officer, in
the form of an affidavit if made by any other person, or in the form  of
a  signed  acknowledgement  of  receipt  of  a summons and complaint, or
summons and notice or notice of petition  as  provided  for  in  section
312-a of this article.
  (e) Admission of service. A writing admitting service by the person to
be served is adequate proof of service.