While troubleshooting missing inbox email for a client, I ran across these instructions to restore an email folder (Inbox) for SmarterMail. This client uses an older version of SmarterMail and these instructions worked perfect with Backup Exec.

• Restore the mailbox from Backup Exec to a temp folder such as C:temprestore
• Log into the SmarterMail web interface as the user and create a new folder called “restore”
• Stop the SmarterMail service on the SmarterMail server
• While on the server, delete the Mailbox.cfg file in the newly created “restore” folder in the users account
• Move all the backed up files from the C:temprestore to the “restore” folder on the SmarterMail server
• Re-Start the SmarterMail service on the server
• Log into the users SmarterMail web account
• Move all the restored messages from the backup folder to the Inbox