Step 2: Add a route for the Vaultastic domain
On the outgoing mail server, add an SMTP route to route all mails for your Vaultastic domain to o365-v4.vaultastic.com For example, if your Vaultastic domain is acmecorp-com.vaultastic.com, then the route should be as follows: Route all mail for...
Step 3: Enable email archiving for users on other imap server
To archive mail from your mail server to Vaultastic, simply add journaling or mail routing rules to forward a copy of incoming and outgoing mail to the journal id on the vaultastic domain. For example, If your primary domain is acmecorp.com, and ...