At some point after routing has been properly configured between the two systems, you should redirect your External sourced inbound (Internet) email to the Exchange server.
- For organizations without coexistence:
External inbound email should be rerouted to Exchange prior to beginning the data migration. This will prevent new mail from arriving in Notes after the migration has begun, and all mail, whether migrated from Notes or newly received from outside, will begin to collect in the users' new Exchange mailboxes.
- For organizations with coexistence:
The external inbound mail can actually be changed at any time after the routing between Notes and Exchange mailboxes has been properly configured. Many administrators choose to defer changing the external inbound routing until half (or all) of their users have migrated to Exchange, to minimize internal mail traffic during the transition period.
Redirect your external inbound email for your primary SMTP domain (for example, domain.com) to the Exchange server. This is commonly done through the DNS configuration on your AD Domain Controller by changing the MX (Mail eXchange) record for your primary domain to point to the new Exchange server. Some companies may employ other types of external inbound mail routing configurations--for example, mail sentries, spam filters or third party message handlers.
For users who have not yet migrated, the routing configuration set by the Microsoft Send/Receive Connector (or otherwise set when the user accounts were provisioned) will route this inbound mail back to the corresponding Notes mailboxes. These routing rules can then be automatically removed by the Data Migration Wizard as each user is migrated, so each user's mail will thereafter be routed to and collected in the corresponding Exchange mailbox.
