You know that overflow hole in your sink? It's about an inch in diameter and is opposite from the faucet.
The inside* of the sink where the water drains through that hole can get filled with gunk which can have a vile smell. Try pouring some bleach down that little hole. May help ... did for me.
good luck..
*I'm sure that there a real name for this but I have no clue as to what it's really called.
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