The incoming spam quarantine holds incoming messages that the filtering system quarantines for manual review.
By default, the quarantined messages are stored for
Sending servers can inform the sender about the quarantined status of the message (if configured in the Quarantine response setting as rejected).
Spam messages that were temporarily rejected at SMTP level (pre-DATA phase of transmission) are not listed in the quarantine but will still be displayed in the log search with the status rejected.
For full details on the filter settings for Spam Experts, see Filter Settings.