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deleted user still forwards incoming mail.
Deleted a user via the online Admin Center, so they're not shown in any active user lists (or any user lists); however the address still forwards onto the formerly assigned recipient. any ideas how t...
For starters, run a message trace and check the details to see what exactly happens with the message. It can be redirected by a mail flow rule, which doesn't need any mailbox in order to function.
When you remove user (and mailbox) they'll be in a "soft deleted" state for 30 days. I'm not 100% sure but I think that the soft deleted mailbox might still forward messages. Removing the mailbox completely could help in your case.
To completely remove the user (and mailbox) you need to run the following PowerShell command:
# Connect to Office 365
Connect-MsolService
# Remove the user from the recycle bin
Remove-MsolUser -UserPrincipalName <your user's UPN> -RemoveFromRecycleBin