With quickbooks cash how do deposit a check that my customer mailed to me.

Welcome to QuickBooks Community, charlesreed.

Let me show you how to transfer funds to QuickBooks Cash.

We need to link a bank account so we can move money in and out of your QuickBooks Cash account. While we're unable to deposit a check, you'll want to deposit it into your bank account instead. Then, you can transfer the funds to QuickBooks Cash.

For the detailed steps, here's how to use your QuickBooks Cash account. 

Also, please check this link: Learn more about QuickBooks Cash accounts and the Cash Flow menu. This includes a compilation of articles and answers to the most commonly asked questions about QuickBooks Cash.

Keep your posts coming if you need anything else. I'll be here!