The provisions of sections five, twenty-two, twenty-six, forty-seven-a and forty-nine-a of this act in respect to the mailing and publishing of notices are for the benefit of taxpayers and shall be construed to be directory only and not mandatory and the failure to mail or publish such notice or failure of the addressee to receive the same shall not invalidate or affect the validity of the taxes on or the penalties imposed by law upon, or of any tax sale of, real property affected thereby.
N.Y. Suffolk County Tax Act § 33-a