Thanks for joining this thread, dennisftc.

I want to make sure your receipts are being sent to the correct business email. 

In this instance, I recommend clearing the browser cache as an initial troubleshooting step. The cache is in place to collect frequently used data to make loading web pages quicker and easier. If it becomes too full it can potentially cause certain viewing and performance errors in the system. Clearing it will remove anything that's preventing the email change  from updating. Here's how to get this done in Chrome for example:

1. Click the three vertical dots in the top right corner and select History, then History again.

2. Select Clear Browsing Data.

3. Choose a time range and then Delete data.

The following article provides similar steps for other browsers: Clear cache and cookies to fix issues

Once you've cleared the cache, please give the steps to update the email a try once more. If the issue persists you may need to contact the QuickBooks Online Support Team.

Please feel free to reach back out if you have any other questions. I'll be here to help in any way that I can.