I am running Exchange 2003 and recently removed a former employee's mailbox. The email for this former user is userA@domain.com. This user had "Send on behalf of" privileges for userB@domain.com.
Now whenever anyone accepts appointments from userB, they get a bounce message trying to send email to userA. The userA account is not in any groups and has been removed from "send on behalf of" for userB, but the bounce messages still occur.
Is there a way I can search and find a rogue permission or setting in Exchange involving userA that is causing mail to still attempt to send to userA's old email address?