Add Succeeded or Failed information to subject line of virtual server scheduled backups

Currently, the email report from Virtualmin for scheduled domain backups looks as follows:

Backup of Virtualmin on myserver.mydomain.com

There is already an option that sends the email on failure, but when that option is not checked there is no quick way of determining the backup status. It would be nice to see either a "succeeded" or "failed" in the subject line.

thanks
carl