Hello, @KristySB. 

Thanks for the clarification on your issue. The only reason you should raise a concern on how to stop the payment is if the vendor is set-up for direct deposit. That's when you'd need to contact our Customer Support Team to see if you're in the timeline for the payment. However, since the check was lost in the mail, contact your financial institution so they can properly stop the check from being used. The best way to record this in QuickBooks is to void the payment.   

Below are two articles that can give some additional insight into this problem. 

• Void or delete a bill or bill payment check

• Void a Direct Deposit Vendor Check

Remember, I'm only a post away if you need anything else. Enjoy the rest of your week!