Log Retention Setting
From Roaring Penguin
For an on premise installation of CanIt Domain-Pro you are able to increase the log retention time by editing the /etc/mail/canit/canit.cont file. Note that this will increase the amount of space required for logs.
The following demonstrate an example of the setting that should be added.
[logindexer] keep_log_days=60
Then after editing the file you will need to run:
service canit-system restart
If you have a cluster this needs to be done on all nodes.