Hi @Brenda F. Portwood ,
Thanks for your reply!
Based on my research, i found a fixed issue which is similar with your case. Please check the version of your current Outlook and make sure you have updated Outlook to the latest version to check if the issue persists.
If the above doesn't help, it's suggested that you could try to select the email and click Never Block Sender to check if there're any differences.
Hope the above help!
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