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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Does the smell come from the sink or the dishwasher?
Is the dishwasher connected to the disposal? When you say "closed cupboard" do you mean it is not accessible? Is the disposal new or used or was it removed then replaced?
Are you able to post a picture of the disposal and piping? The smell only comes from under the cabinet and not from the sink or the dishwasher?
Are you still going to post pictures?