Maintenance Mode
Setting maintenance mode is essential when conducting upgrades as it will ensure that no new documents/emails are imported after the upgrade is completed, as when a rollback is necessary, the imported documents will no longer be available in watched mailbox.
Turning On Maintenance Mode:
- Configure papertrail to start in maintenance mode by adding the following line to the 
conf/papertrail.propertiesmode=Maintenance - Restart PaperTrail
 
Turning Off Maintenance
- Remove or comment out the mode property in 
conf/papertrail.properties - Restart PaperTrail