Either there is no default mail client or the current mail client cannot fulfill the messaging request - this is the message I get. cannot mail. Similar message for excel

Good Morning keithb,

Let's make sure this error message gets taken care of.

This error message appears when you try to send an email from a third-party program because the Outlook registry key is corrupted, and they cannot retrieve the required information from the registry.

To resolve this issue, you'd need first to remove the corrupted registry key, and then perform a repair. Please note that this process should be done by an IT professional or your email provider as fixing your computer's registry, if performed incorrectly, can severely damage the operating system and render the computer unusable.

You are always welcome to check with us if you need help about QuickBooks. We're ready and excited to help you, keithb.

What registry key?

I'm having the same issue after using QB since March with no problems.  I'm thinking it has something to do with the latest update from QB.  Can we get a fix for this ASAP, please?

Hi there, @shay13.

Let me share with you the possible reason why you're getting this error message and provide you an immediate solution to this.

As mentioned above, you may run into this issue if your registry key is corrupted. This error may occur when you send an email from a third-party app using Microsoft Outlook. 

Also, QuickBooks updates are intended to improve the program's functionality and resolve various issues. Thus, this makes sure that the product is always compatible with the applications that it's integrated. Having said, we can assure you that this concern isn't related to any product updates. 

To resolve this concern, make sure to set Outlook as the default mail client. You can also run a repair tool on Microsoft Office or uninstall and reinstall it to clean its registry and preferences.

Before taking these actions, I highly suggest contacting a Microsoft IT Expert so they can provide you the proper steps. This way, we can avoid damaging your computer's operating system.

In case you need tips and related articles on your future task, you can check out this link: https://quickbooks.intuit.com/learn-support/en-us/get-started/07?product=QuickBooks%20Desktop.

Please let me know if there's anything else I can do to be of assistance. Just place your concern by clicking Reply and I'll get back to you. Have a wonderful day and stay safe.

I have run Quickbooks repair tools and Office repair tools.  Outlook is the default mail client.  I continue to get this error.  It started just this week.  In fact, it was working on 9/23 and not working on 9/25.

To add to my previous post, I am experienced with editing the registry.  If that is the best solution, please provide the necessary details.

Hi there, @bhibler.

This error is caused by an outdated Microsoft Office 365 release. To fix it, you can update your Microsoft Office 365 to the newest release version. Here's how

1. Open Outlook, then select the File tab.
2. Select Office Account, then the About Outlook button. Note: Make sure you see the latest release of the build.
3. Select Update Options and then Update Now to update the newest release.
4. Go back to QuickBooks and try to email your report or transaction again.

If the issue persists, you can follow these next troubleshooting steps:

Step 1: Edit your admin privileges

Make sure QuickBooks isn't set to automatically run as an administrator.

1. Close your QuickBooks Desktop application.
2. Click the Windows Start icon at the toolbar.
3. Type "QuickBooks" in the search, then right-click the QuickBooks icon and choose Open file location.
4. Right-click the QuickBooks.exe file and select Properties in the folder.
5. Choose the Compatibility tab.
6. Select to uncheck the Run this program as Administrator option. If the option is grayed out, select Show Settings for All Users to make the option available.
7. Click Apply and then OK.

Open your QuickBooks Desktop application and send a test email or transaction. If you still receive an error message or still cannot send an email, you can refer to this link for more troubleshooting steps: How to fix "Error: QuickBooks is unable to send your email to Outlook".

Let me know if you have more questions about connecting a bank account in QuickBooks Online.

The last step that worked for me was to Run the office 365 setup for current Windows user profile. 
Office / outlook was already installed on this machine for more than a year and current user was using it n never had any issue. I tried run repair but that did not make any difference. But running office 365 setup again resolved the issue. Not sure if that was something with registry.

Previously I tried changing QB compatibility setting, resetting Default email client as Outlook, running QB + MS office + Windows update, Repair IMAP,l.

I tested sending email from QuickBooks after each step.