How To Configure Your Account For A Split Domain

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A split domain is when 1 domain is hosted on multiple servers (for example a POP3/IMAP server and an Exchange server).
We do not recommend this configuration, but it will be functional.

1. Configure the MX records for the domain to point to the POP3/IMAP server only.

2. Configure the AutoDiscover record as described in our KB (here).

3. Configure a secondary email address on each Exchange mailbox using the built-in domain, as described in our KB (here).

4. Configure the appropriate mailboxes on the POP3/IMAP server to forward messages to the secondary email addresses configured in step 3.

5. Remove the authoritative feature for your domain in Exchange as described in our KB (here).