During your migration you may have a few emails that don’t complete the migration to your new messaging system. While configuring the connector you have the ability to customize your notifications to alert you when items have failed or when they have been successfully migrated.
To customize the types of notifications you will receive you need to use the advanced settings when configuring the connector. In the advanced settings you can set up notifications to alert you of every successful migration or each failed item. The failed message will only tell that a message has failed to migrate unless you select the box that to have the subject of each message logged during configuration.