Sorry you didn't receive this info immediately! It should have been emailed to you, available via download from your order completion page, along with our contact info. In any event, you can contact us via our aim/ichat name:
help@01.com (looks like an email address, is a chat address), see our hosted Zimbra
contact info and, we have an article covering mail exchange (MX) records in our
Zimbra hosting FAQs section.