From under the house. We are on city water and it is an older house, builit in the 50's. I have poured baking sods, viengar, hot water etc. and it always comes back. What can I do. Thanks.. Sharon

If it's under the house are you sure there is not a leak? If it is coming up the drain, you may have a vent issue and the water flow is sucking water out of the trap. Pour water into the drain. Does the smell stop? Flush a toilet and see what happens at the drain.

If your kitchen drain doesn't give off a face full of stinky then you have no choice but to get down in the crawl space and see what's going on. If the water pipes are dry then you have a break in the drainage that must be corrected ASAP. Good luck, Tom