By default, the Messaging system stores messages in the Inbox folder. Users with IMAP access to their mailbox can create folders in addition to their Inbox folder. The administrator can control the number of days the Messaging system stores messages in the Inbox folder or a folder that the user creates.
The messages can be kept in the Inbox folder or the user created folder forever, or deleted after the specified number of days. By default, the Messaging system deletes the messages after 45 days. The range is 0 to 999. The system automatically deletes messages during the nightly audits after the message age equals the administered number of days.