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 corresponding user id on the vaultastic domain.
If your primary domain is acmecorp.com, and you wish to archive for firstname.lastname@example.org, then the journaling rule should send a copy of all mail received and sent by email@example.com to firstname.lastname@example.org.
In case you have additional queries or need assistance, write to us at support@.vaultastic.com.
Vaultastic does not support email archiving for email ids hosted on public email networks such as Yahoo, Gmail, Rediff etc.
Vaultastic supports connectors for your domains hosted on GSuite/Gapps, O365, Hosted Exchange etc.