To enable direct mail delivery from your MailEnable server to Vaultastic, allow SMTP connection on Vaultastic.
To setup email archiving for MailEnable, you need to configure MailEnable to setup a mail route (SMTP Connector) for Vaultastic server. This SMTP connector will be used to route mail from MailEnable to Vaultastic.
To archive mail from your primary domain hosted on MailEnable you need to configure filters. These filters forward mail from your primary server to the Vaultastic server.