If i try to send an email from quickbooks to the email address my account is registered with the email fails to deliver.

Welcome to the Community, @jbishop255-hotma.

 I will share some information about your concern about sending invoices in QuickBooks Online (QBO)

One of the reasons you are experiencing this is that you are using an old browser. I advise upgrading to the most recent version. I suggest performing browser troubleshooting to isolate this.

You can start by using a private browser. Follow the commands below:

Google Chrome: press CTRL  + Shift + N

Mozilla Firefox: press CTRL  + Shift + P

Internet Explorer: press CTRL  + Shift + P

Safari: press Command + Shift + N

If it works using a different or private browser, go back to your default browser and perform clear the cache to remove temporary internet files on your computer. Before doing so, take note of your saved passwords and URLs.

Here's how:

1. Open Chrome.
2. Click More.
3. Choose More Tools, then Clear browsing data.
4. Add a time range. Select All time to delete everything.
5. Check the boxes next to Cookies and other site data and Cached images and files.
6. Select Clear data.

I’m adding some links below for additional resources. These articles will guide you on how to troubleshoot email delivery issues. They’re from another region, but the solutions also apply to the UK version.

• How to view a list of bounced emails with delivery errors
• Delivery Errors when trying to email a sales form

Get back to me if you have additional concerns about emailing invoices and estimates in QuickBooks Online. I’ll get back to ensure this is taken care of for you. Have a good one.