block calendar invitations

Question

block calendar invitations

Ann Kelly 0

How can I block spam invitations to my calendar. I don't have 50 characters

Alicia Williams 10 Reputation points

2025-11-03T21:05:13.5633333+00:00

I have basically the same question, with a few caveats. There’s no email that goes with the invitation that was added to my calendar & Every time I tried to delete it. It pops right back up. And how do you block the sender?
TA 0 Reputation points

2025-12-03T15:20:18.61+00:00

I created a rule to send all invitations to spam, but I don't see how to create an exception for people on my safe list without adding each individual email. This is awful. My calendar is now completely useless. I got tons of these everyday, buried within thousands of junkmail, so they are not easy to find and delete without going into the invitation. I see people have been reporting this issue since 2023. Microsoft, needs to find a solution ASAP. People, like me, who have been with hotmail for decades may have to jump ship for persistent issues like this that render the service unusable.

3 answers

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Alicia Williams 10 Reputation points

2025-11-03T21:05:13.5633333+00:00

I have basically the same question, with a few caveats. There’s no email that goes with the invitation that was added to my calendar & Every time I tried to delete it. It pops right back up. And how do you block the sender?
TA 0 Reputation points

2025-12-03T15:20:18.61+00:00

I created a rule to send all invitations to spam, but I don't see how to create an exception for people on my safe list without adding each individual email. This is awful. My calendar is now completely useless. I got tons of these everyday, buried within thousands of junkmail, so they are not easy to find and delete without going into the invitation. I see people have been reporting this issue since 2023. Microsoft, needs to find a solution ASAP. People, like me, who have been with hotmail for decades may have to jump ship for persistent issues like this that render the service unusable.

Answer 1

SPAM Calendar Events - Update 2025-12-05 - Still an ongoing issue. No update from Microsoft on a general solution.

If your organization has a Microsoft Defender for Office 365 subscription, there are steps your IT Admin 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

Answer 2

Hornblower409 8,850

Microsoft is aware of the problem but there is currently no fix. There are no Rules you can create or settings you can change in the Outlook client that will stop these SPAM Calendar Events.

https://learn.microsoft.com/en-us/answers/questions/5597205/prevent-pfishing-calendar-items

Hal Hostetler MVP-Outlook MVP Volunteer Moderator Oct 26, 2025, 12:21 PM FWIW, this issue has been reported to Outlook Engineering, they are aware of the problem, and are investigating it.

0 comments

Answer 3

Carlo Luna 6,895 Independent Advisor

Hi Ann,

Thanks for reaching out. I understand how frustrating it is to keep getting spam calendar invites in Outlook for iOS.

Unfortunately, you can’t completely block them, but you can reduce them. Open the Outlook app, go to Calendar, select the spam event, tap Decline, and choose Delete and Decline if prompted. If they keep appearing, check iOS Settings > Calendar > Accounts for any unfamiliar subscribed calendars and remove them. You can also block the sender and report the invite as Junk or Phishing in Outlook.

Do these invites show up only in Outlook or also in your iPhone’s native calendar?

Let me know how it goes. I will be more than happy to assist you.

Regards,
Carlo

Ann Kelly 0 Reputation points

2025-11-04T01:54:35.2866667+00:00

I found that going to my junk mail folder and finding the sender of the invitation and deleting the message deletes to calendar invitation
Alicia Williams 10 Reputation points

2025-11-04T16:07:26.7666667+00:00

Thanks for the suggestion, but there’s absolutely nothing in my Outlook junk email. These scam invitations that are being sent to me are just literally being posted directly to my calendar no email no way to stop it. I’ve tried to block the person that is being sent from and there’s no way to block it. Strangely enough it’s not actually showing up on my Outlook calendar, but it’s showing up on my iPhone calendar as if it’s coming from my Outlook calendar but when I go to my Outlook calendar, there’s nothing there. So I basically had to turn my Outlook calendar off completely.
wtp 5 Reputation points

2025-11-07T14:53:59.98+00:00

Any idea how long it might take for Microsoft to create a way to block them?

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block calendar invitations

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