As an an admin /user of the Vaultastic domain, you can export mail from your Vaultastic account and restore into your live mailbox.
Exported data is uploaded to the cloud and can be downloaded by clicking on the link sent by email. By default, the size of the file is set to 2147483648 Bytes that is 2 GB.
If the exported data exceeds the maximum size, then the data will be split into two or more files, each of max file size. The email will have links to all the files.
If you have admin privileges, you can configure the size of a PST file to export from the Vaultastic account of a user.
To export email from the Vaultastic account,
Log in to the Vaultastic Self Service Portal
Click the Export icon to export the Inbox folder.
To export the Sent Items folder, navigate to the Sent Items folder and then click the Export icon to generate the .EML or .PST file.
To export specific mail messages, execute a search query and export the result of the query to generate .eml or .PST file.
If the size of your Inbox/Sent Items folder is huge, application exports multiple files.
Choose the .EML or .PST format to which you need to export the file.
You can import this .EML or .PST file to the desktop client you are using.
You will receive the exported file to the Primary email-id set for your account.