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How to stop junk mail from posing on calendar?

charles mcmanus 0 Reputation points
2026-06-04T23:53:01.8466667+00:00

I have on going issue with junk mail posting on calendar, how do I stop this?

Outlook | Web | Outlook.com | Calendar

Answer accepted by question author

Sumit D - IA 169.9K Reputation points Independent Advisor
2026-06-05T00:31:57.2166667+00:00

Hi,

I am afraid this is an ongoing problem and you cannot do much in this case.

Via HornBlower's post here:

https://learn.microsoft.com/en-us/answers/questions/5829157/scam-outlook-calendar-invites

This is a know issue. Microsoft is aware of the problem but there is currently no fix. Unless you are in an IT Managed Environment there is nothing you can do to stop them.

SPAM Calendar Invites - Main Thread https://learn.microsoft.com/en-us/answers/questions/5597205/prevent-pfishing-calendar-items

You can vote for and comment on this Feature Request: https://feedbackportal.microsoft.com/feedback/idea/29cad13e-0948-f011-a2da-7c1e529ed9e2 (You must "Sign In" at the top right before you can vote).

Possible Workarounds (IT Managed Environment)

If your organization has a Microsoft Defender for Office 365 subscription, there are steps you can take to mitigate the impact:

https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/strengthening-calendar-security-through-enhanced-remediation/4456876

If you are in an IT Managed environment there are Mail Flow Rules that your IT Admin can implement that will block all external Calendar invites (and allow for specific exceptions):

https://learn.microsoft.com/en-us/answers/questions/5558001/how-to-prevent-calendar-invites-from-external-sour

I hope this information helps. If you have any more questions, don't hesitate to reach out.

Otherwise, if your problem is resolved, please take a moment to rate the answer. Wishing you good luck!

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  1. AI answer

    2026-06-04T23:53:10.5566667+00:00

    In Outlook.com / Outlook on the web, junk messages that auto-create calendar events usually come from unwanted senders or domains. The most effective way to stop this is to block those senders and ensure junk filtering is enabled, then treat any such messages as junk so future ones are diverted.

    Use these steps:

    1. Turn on and use junk filtering
      1. Select Settings (gear icon) at the top of Outlook.com.
      2. Select Mail > Junk email.
      3. Under Block or allow or Incoming mail handling, make sure Automatically filter junk email (or the equivalent junk filtering option) is selected so spam is evaluated and moved to Junk Email instead of staying in Inbox.
    2. Block the senders that are creating calendar spam
      1. In Settings > Mail > Junk email, go to Blocked senders and domains.
      2. Select Add blocked sender and enter the email address or domain that is sending the calendar spam (for example, someone@example.com or @example.com).
      3. Select OK, then Save.
      4. Future messages from those senders will go directly to Junk Email, which prevents them from easily creating calendar items.
    3. Mark existing calendar-spam messages as junk
      1. In your Inbox, locate the email that generated the unwanted calendar event.
      2. Select it, then on the toolbar choose Junk and mark it as junk.
      3. This trains Outlook’s junk filter so similar messages are more likely to be moved to Junk Email automatically.
    4. Use Safe Senders/Safe Recipients so real invitations are not treated as junk
      1. In Settings > Mail > Junk email, under Safe senders and domains, add trusted senders and domains (for example, your company domain or known partners).
      2. This keeps legitimate invitations in your Inbox while junk is filtered.

    If junk mail is still landing in the Inbox and creating events, temporarily switching junk handling to a stricter mode and then back (as described in the referenced Outlook.com answer) can refresh spam handling; after a few hours, spam should again route correctly to Junk Email instead of Inbox.

    References:

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

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