Dec 17 2018
- last edited on
Feb 06 2023
Beginning 12/13/18 we got a report from one of our end users that Calendar invite emails were being sent multiple times to the recipients (both internal and external).
The recipient would report receiving the invite many times (10+ in many cases) but the invite email only shows up once in the meeting creators Outlook Sent Items folder. We verified through message tracker that the invite is actually being sent by O365 several times so it's not something wrong with the recipients side recreating them.
We now have several users who are reporting this issue as of 12/14.
We thought it might be Outlook or Outlook plugin related but we've kind of discounted that because even with Outlook closed the invite emails continue to be sent.
Is anyone else seeing this type of activity? We have a ticket opened with O365 support but it hasn't yielded any positive results yet. Thoughts?
Dec 17 2018 11:29 AMSolution
Dec 18 2018 05:24 AM
Do you know if the meetings were accepted on a Apple device? This is a regular occurrence, while various fixes have been attempted, eventually the breakdown happens again. I would suggested deleting the meeting on the Apple device and accepting the meeting on a Windows machine if possible.
Dec 18 2018 09:24 AM
We spent some time digging into the message trace logs further and noticed that the duplicates meeting invites that were being sent were "From IP: 18.104.22.168". That's not one of our IP addresses so a quick Google search indicated that it's a Salesforce IP address. We do have Salesforce and are using the Lightning to Office 365 API integration to provide syncing of Contacts and Calendar events. It seems like something changed on the Salesforce side so every time that sync occurs Salesforces sends out a new meeting invite to all the recipients. We're now working with Salesforce on what might be causing that.
Thanks everyone for your ideas!
Jan 15 2020 02:33 PM
I work for a corporation and a trade association and whenever people try to accept invites from an Apple device, it doesn't show up on their calendars and subsequently duplicate invites keep hitting their inboxes. Accepting invites some webmail and outlook are fine, just the apple devices are problematic. Thanks for any insights @Terry Hugill
Jan 15 2020 11:06 PM
May 06 2021 08:27 AM
We have the same problem. When we receive an invitation from a Google calendar, the sender of the invitation is spammed with countless emails. In addition, we receive "undeliverable" messages.
Sender is always firstname.lastname@example.org. Does anyone know how to fix it?