Solved Outlook Calendar is Auto Sending appointments to a 3rd party

Microsoft Office home and business 2016...
September 5, 2017 at 17:27:46
Specs: Windows 10
Every time I book an Outlook calendar (2016) appointment it automatically sends the appointment to a third party email that is a real person, but not the intended recipient. I don't add the email in to the invite, it seems to show up after the fact. The person whose email is automatically being added keeps declining the appointments, however I would like to stop them from receiving at all. Any suggestions?

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September 6, 2017 at 00:47:08
✔ Best Answer
Do you have any rules setup in Outlook?

On the ribbon go to Home >> Rules >> Manage Rules & Alerts and check if you have any rules to auto forward appointments

Do you have any VBA in the back of Outlook?

Whilst in Outlook hold ALT and press F11. This will open the VBA windows. On the top left you should see something called Project do you see any modules or code when you double click any of the items within the project list?

They are the only two reason I can think of that will automatically send your appointments to someone else. Have a look and come back with results.

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September 6, 2017 at 11:22:22
Thanks for the help. As above, here are the results:

1. Checked rules, nothing listed there at all

2. Under the VBA window, there is a Project1 listed and when clicked on it there is no content showing

3. Have also run a couple of different virus and malware programs that have come back clean

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September 6, 2017 at 12:30:05
Is this "third party" listed in your contacts? How friendly are you with this person? By that I mean, is it someone that would be willing to let you test some things to help track down the problem?

Things like...

Delete them from your contact list and see what happens when you send an appt request.
Alter the contact email address to something that is not valid and try it.

If they still get it, then it's not related to your contact list, i.e. the calendar system is picking up the third party's addy from someplace else.

Is it possible that you or one of the proper recipients has the third party set up as a Delegate? I found this at

"Turns out it was a delegate on the user being sent the invitation, he uses mac mail so it may have different default options for delegates, I had to log on to a windows machine with his account and under delegates remove the option to 'send meeting replies to my delegates'"

Could one of the proper recipients have their email set to forward to the third party?

(I am not an Outlook expert by any means, I'm just tossing out some possibilities that I found on the web and would try if I had to troubleshoot this myself.)

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September 8, 2017 at 17:14:53
Interesting. After the OP stated that there were no rules or macros involved, the thread was marked Solved based on the response that suggested those 2 items.

Sure would be nice to know what the actual solution was. That would make the archives very happy.

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