As the error message indicates, it can occur if your account is flagged for sending spam or if it is blocked. If you are also troubled by this error, here are a couple of troubleshooting tips to help you resolve the delivery has failed to these recipients or groups error in Windows.
How do I fix delivery has failed to these recipients or groups?
1. Check if the account is blocked
Microsoft may block the user account due to suspected outbound spam. If you are an administrator for the Office 365 account, you can unblock the account by following the steps above.
2. Check if your account is compromised
What to do if the email account is compromised?
3. Remove the original email address
4. Check for bad email habits
The delivery has failed to these recipients or groups error in Outlook /Exchange can occur if the user account is blocked for suspected spam or if the user is following bad email practices. Follow all the steps in this article and let us know which method helped you resolve the error in the comments.
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