E3 license removed but mailbox still receives mail.

[VirtualTech]

Hi

Issue: E3 license removed but mailbox still receives mail.

I was wondering if anyone knows why this happens? 

Solution: Remove the proxy addresses from on-premise AD account

Env: On-premise AD, Hybrid syncing to Azure AD. 

[#2]

@VirtualTech 

quick question: when you say "mailbox still receives mail" do you mean:

1. The user is still capable to access his/her mailbox via OWA/Outlook client and send/receive email
2. You see inbound mails coming into the target user mailbox

If point 1 is the case then is very weird

If you refer to point 2 then I guess is the expected behavior. 

If not mistaken, when you remove a user's license, the user mailbox will remain in Exchange Online until it is deleted by an Exchange or M365 admin.