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How can I prevent spam invites appearing on my Outlook Calendar

Gary Farrell 5 Reputation points
2026-03-25T23:24:28.8133333+00:00

I get at least 2 or 3 unwanted Invites on my calendar per week. I resort to either deleting the event or, if I can't do that, finding the email in my Junk folder and deleting it.

I have tried "Rules", searching for "Invite" or "Invitation" in the Subject or body, and then Deleting it. I immediately run the Rule. Neither works.

I also tried the Calendar, Events and Invitations settings that filter the various types of Invites.

I could be doing something wrong with configuring these settings but I haven't figured it out.

I am using the latest version of Outlook on Windows 11.

Microsoft 365 and Office | Other
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  1. Arlene D 36,070 Reputation points Independent Advisor
    2026-03-26T00:48:50.6466667+00:00

    Hello, are these spam invites from external senders outside your organization or from random email addresses?

    Use the built in calendar setting to stop Outlook from adding invites automatically. Open Outlook, select Settings, then go to Calendar, then Events and invitations. Turn off the option “Add events to my calendar from email” and set it to only add events from known senders or turn it off completely. Then go to Mail, then Tracking, and set responses to meeting requests to Never send a response automatically. This keeps unknown invites from being added to your calendar unless you accept them manually.

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  2. AI answer

    2026-03-25T23:24:43.7333333+00:00

    Use a combination of junk filtering, blocked senders, and calendar invitation settings so spam invites never reach the calendar.

    1. Strengthen junk filtering and block the senders/domains
      • In Outlook (new Outlook for Windows / Outlook on the web):
        1. Select Settings (gear icon).
        2. Go to Mail > Junk email.
        3. Under Blocked senders and domains, select Add blocked sender and add the email addresses or domains that are sending the spam invites.
        4. Select OK, then Save.
      • Messages from these senders will go directly to Junk Email and will not normally generate useful calendar items.
      • If any legitimate senders are being misclassified, add them under Safe senders and domains instead so their messages never go to Junk.
    2. Use Outlook’s junk mail features instead of rules
      • Outlook’s built-in Junk E-mail Filter is designed to detect and move spam to the Junk E-mail folder automatically, including spam that contains meeting requests.
      • This is more effective than simple subject/body rules because it uses additional spam signals. Ensure junk filtering is enabled and rely on it for most spam invites rather than custom rules.
    3. Turn off automatic processing that can help spammers
      • Spammers sometimes use meeting requests and read/delivery receipts to confirm that an address is valid.
      • Reduce this by turning off automatic processing of meeting requests and read/delivery receipts where possible, especially for messages coming from outside trusted senders. This lowers the chance that interacting with a spam invite confirms the address and leads to more spam.
    4. Adjust calendar “Events and invitations” behavior (for Outlook on the web / new Outlook)
      • In Outlook on the web:
        1. Select Settings > View all Outlook settings.
        2. Go to Calendar > Events and invitations.
        3. Review options such as automatic processing of invitations and whether invitations are deleted from the Inbox after responding.
      • For spam control, keep invites visible in mail (so they can be treated as junk) and avoid auto-accepting or auto-processing invites from unknown senders.
    5. Regularly clear Junk and verify blocked/safe lists
      • Periodically empty the Junk Email folder so old spam invites and their calendar items are removed.
      • Re-check Blocked senders and domains and Safe senders and domains to ensure no spam domain has been accidentally added as safe.

    If spam invites continue after blocking and junk filtering, review any mailbox rules again to ensure none are moving spam messages out of Junk or automatically accepting invites.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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