A user can see/use my inbox without permission

Question

One of my colleagues has since yesterday access to my inbox despite having no permission for.  
When he opens Outlook my inbox appears listed below his own, and he can do any action (sending, receiving, deleting, ...).  
This seems to happen only on his PC, not e.g. on his mobile phone.  
  
1) My Inbox has default permissions and the only thing I share (specifically with this colleague) is my calendar.  
2) No users has access permission to the inbox of the others.  
3) I'm the most privileged user, but not on personal inboxes - I have permissions on group emails.  
  
Does anybody has any idea what could be the reason for this strange behaviour?  
Any help is welcome.  
  
Thanks  
Claudio

robinkaws · Accepted Answer

Hi Claudio,  
  
The service team investigated your issue and it seems you have misinterpreted the way WorkMail permissions work. You have given multiple groups full mailbox access permissions on your user. This means that all members of these groups have full mailbox access to your user and explains why your colleague can open your mailbox without you giving explicit permissions to do so.  
  
If you want to give your user permissions on groups you need to add your user to the group.  
  
I will check with the service team to review the documentation and console details for this.  
  
Kind regards,  
Robin

cspa · Answer

Ops. Thanks for the quick investigation and clarification.  
  
I'm now fixing the configuration and as soon as my colleague will confirm on his side, I'll make the question as answered.  
  
Thanks  
Claudio

robinkaws · Answer

Hello Claudio,  
  
I'm sorry to hear you're experiencing problems with permissions on you mail store. I have escalated this case to the service and will get back to you on this asap.  
  
Kind regards,  
Robin

A user can see/use my inbox without permission

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