Forum Discussion

Copper Contributor

Aug 29, 2025

Solved

Mystery Emails for Meeting

Hello I have this weird issue that I have been tracking down. A user's mailbox sends emails out every night as reminders to an appointment that they setup. The email goes to all participants in ...

exchange online

office 365

outlook

Martin-Apps4Rent
Aug 29, 2025
This is not malicious. It is usually caused by a corrupted recurring meeting or a sync issue with Outlook or the iOS Calendar app. When the organizer's device keeps re-syncing, Exchange treats it as an update and sends reminder emails again.
The best fix is to cancel and recreate the recurring meeting. If the user is syncing with iPhone or iPad, try disabling calendar sync temporarily to confirm. If it continues, you can run a calendar repair on the mailbox in Exchange Online.

Martin-Apps4Rent

Iron Contributor

Aug 29, 2025

This is not malicious. It is usually caused by a corrupted recurring meeting or a sync issue with Outlook or the iOS Calendar app. When the organizer's device keeps re-syncing, Exchange treats it as an update and sends reminder emails again.

The best fix is to cancel and recreate the recurring meeting. If the user is syncing with iPhone or iPad, try disabling calendar sync temporarily to confirm. If it continues, you can run a calendar repair on the mailbox in Exchange Online.