N.Y. Elec. Law § 8-410

§ 8-410. Absentee voting; method of. The absentee voter shall mark an\nabsentee ballot as provided for paper ballots or ballots prepared for\ncounting by ballot counting machines. He or she shall make no mark or\nwriting whatsoever upon the ballot, except as above prescribed, and\nshall see that it bears no such mark or writing. He or she shall make no\nmark or writing whatsoever on the outside of the ballot. In cases where\nthe express intent of the voter is unambiguous, any stray marks or\nwriting shall not be a basis for voiding a ballot. After marking the\nballot or ballots he or she shall fold each such ballot and enclose them\nin the envelope and seal the envelope. He or she shall then take and\nsubscribe the oath on the envelope, with blanks properly filled in. The\nenvelope, containing the ballot or ballots, shall then be mailed or\ndelivered to the board of elections of the county or city of his or her\nresidence or deposited in an absentee ballot drop box established by the\nboard of elections of the county or city of the voter's residence.\n