is your vent pipe for the kitchen drain stopped up? if not open, the water in your kitchen sink drain trap will be siphoned-off after every use, leaving the trap empty of water. without water to block the sewer gases you should get a hideous smell coming out of your sink. if you only smell the sewer when you open your cabinet doors you may have a hole in the trap or in the pipe behind the trap nearer the wall where the pipe exits. as for the rotting wood hypothesis, have you ever smelled rotting wood that smelled like sewer gas? me neither. your landlord’s ‘bacteria band-aide’ did not work, did it??