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Let's get rid of the error so you can email your estimates again, wendysherrard.
Before we do any troubleshooting steps, I'd recommend updating QuickBooks Desktop to the latest release. This will fix common issues caused by previous updates.
After that, we can follow the steps in this article to reauthorize QuickBooks Desktop to use Gmail: Reauthorize QuickBooks Desktop to keep using Gmail.
You might also find these following links helpful regarding the email issues in QuickBooks Desktop:
We'll be right here if you need additional assistance in sending your estimates.