How can duplicate email addresses be prevented within groups when adding new members?

Question

How can duplicate email addresses be prevented within groups when adding new members?

Reed Samantha 0

I added new members to a group in Outlook, but the system created duplicate entries. Instead of showing 10 members, the list now contains 20 people because 10 members were added twice. I do not want those members to receive emails twice.

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Answer 1

Hello Samantha,

Thank you for explaining the issue. I understand your concern, especially since you want to prevent members from receiving duplicate emails.

If you are using a Microsoft 365 Group in new Outlook, I recommend checking the membership list and removing any repeated entries:

Open Groups from the left-hand app bar in new Outlook.

Select the group you updated.

Under the group name, select the displayed member count to open the membership list.

Check whether the same email address appears more than once.

If you find duplicate entries, select the Remove from group icon next to the extra entry and confirm.

After removing the duplicates, reopen the membership list and verify that each intended email address appears only once.

For future additions, check the existing membership list before adding new members, and add only those who are not already listed.

Microsoft provides the steps here: Add, edit, and remove members of Groups in Outlook.

Could you also confirm whether you are managing a Microsoft 365 Group under Groups, or a personal contact list under People? These are different Outlook features, and the steps for managing their members are not the same.

Kind regards,