How do I stop email addresses duplicating in groups when adding a new member

Liz L 0 Reputation points
2026-11-12T11:10:59.3433333+00:00

I have been adding new members to a group in outlook, it is duplicating their entry. So instead of showing 10 members, I now have 13, as 3 of them have been added twice.

I don't want those members getting the emails twice.

Outlook | Web | Outlook.com | Contacts

1 answer

Sort by: Most helpful
Most helpful Newest Oldest
  1. Emma1-N 15,005 Reputation points Microsoft External Staff Moderator
    2026-11-13T07:40:05.2566667+00:00

    Welcome Liz L,

    I understand your concern about duplicate members receiving the same emails.

    First, could you clarify whether you are using an Outlook contact list or a Microsoft 365 Group?

    If you’re using a contact list, please try these steps:

    • Open Outlook.com
    • Select People from the left navigation pane.
    • Open Your contact lists and select the affected list.
    • Select Edit, check for duplicate email addresses, remove the extra entries, and save your changes.
    • For reference: Create, edit, or delete a contact list in Outlook.

    Also, does this happen with every new member you add, or only with certain email addresses?

    Looking forward to your update.

    Was this answer helpful?

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.