I have a sub-tenenat, CLF, that has shared my Exchange 2007 Server for some time. They are now moving out and I have migrated their email to a hosted Exchange account and changed their MX records. They are able to send and receive emails on that new server just fine with the exception of emails to and from my Exchange server (their old one). I know I have got to be missing something but can't figure it out.
Once I verified their new email was working properly, I have performed the following tasks on my Exchange server:
•Removed their domain from Organization Configuration > Hub Transport > Accepted Domains
•Removed the email addresses from individual accounts
Is there anything else I need to do?