All persons who in reliance on any such decree or order make any payment to, or permit any transfer or act to be made or done by, the wife who has obtained the same shall, notwithstanding such decree or order may then have been reversed, discharged or varied, or the separation of the wife from her husband may have ceased, or at some time since the making of the decree order been discontinued, be protected and indemnified as if, at the time of such payment, transfer or other act, such decree or order were valid and still subsisting without variation, and the separation had not ceased or been discontinued, unless, at the time of the payment, transfer or other act, such persons had notice of the reversal, discharge or variation of the decree or order or of the cessation or discontinuance of the separation.