How do I tackle smelly drain in the kitchen sink?

Do you have garbage disposer ? Do you have Trap under the sink ?

Smell is usually product of bacteria growth inside your drains. There are some home grown remedies that will work well for you. Try to pour vinegar into the sink drain and let it sit there overnight. Do same with garbage disposer. Also, always keep your sink clean and use lots of hot water every time you use sink to flush down dirty water.

Thanks Milo Dolezal, I will try the vinegar. I don't have a garbage disposer so I hope the vinegar works. Thanks again

Another way would to pour 1/2 gallon of full strength bleach down both drains and let set overnight.
Next morning flush the line out with a sink full of hot water. Let us know which method works best for you. Good luck, Tom