Need help on spam calendar invites/being added to groups/too many blocked senders

Heather Orsanic 5 Reputation points
2026-09-02T23:40:20.6233333+00:00

HELP! I'm being added to 50+ unwanted groups (groups.outlook.com) DAILY - this is a personal account. Each of these groups are adding 2+ calendar invites and my Outlook calendar is a mess. I know this is a known issue and I've reported these messages, I've created rules to try to deal with them and I've blocked the senders. Not only are the rules not working but now I've apparently reached the maximum amount of blocked senders I can have. The amount of time I'm spending to try to keep my inbox and calendar clean is ridiculous. You need to fix this groups loophole and remove block sender limits.

I know you probably don't care about my monthly subscription, but I am a paying customer. YOU NEED TO FIX THIS

Outlook | Web | Outlook.com | Account management, security, and privacy
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  1. Chloe-V 12,615 Reputation points Microsoft External Staff Moderator
    2026-09-03T04:17:35.17+00:00

    Hi @Heather Orsanic

    I’m very sorry that you’re dealing with such a large volume of unwanted group invitations and calendar event invitations. I understand that reporting them, blocking the senders, and creating rules have not resolved the problem.

    Currently, Outlook allows up to 10,000 entries across the Safe Senders and Blocked Senders lists. Blocking the groups.outlook.com domain may also affect legitimate Outlook groups, so I would not recommend doing this if you use any legitimate groups.

    As an additional troubleshooting step, you may check the message headers to determine whether the visible sender address has been spoofed. However, because this case involves repeated unauthorized additions to Outlook Groups and associated calendar events, blocking the address found in the headers may not fully prevent the problem.

    Because this appears to involve repeated unauthorized additions to groups rather than ordinary spam, please contact Microsoft Support directly for further assistance.

    Please note that this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance regarding reported problems, requests, or suggestions.

    Thank you for your understanding.

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.  

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  2. Hornblower409 14,690 Reputation points
    2026-09-03T19:07:41.8766667+00:00

    @Heather Orsanic said

    Not only are the rules not working but now I've apparently reached the maximum amount of blocked senders I can have.

    Blocking the Sender or putting Rules in place will not stop Group Joins and the Calendar Events they generate.

    I'm being added to 50+ unwanted groups

    I am sorry that you got targeted with this kind of Spam attack, and while it won't help fix your immediate problem, I suggest that you Vote for this Feature Request. If enough people complain maybe Microsoft will give us an option to stop Spam Group Joins.

    Add an option to block being added to Outlook Groups without consent
    https://feedbackportal.microsoft.com/feedback/idea/a17de24f-8ce6-f011-92b9-7c1e5244b89c
    (You must "Sign In" at the top right of the Feedback page before you can vote).

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