KSMG/KLMS messages delayed for 50 minutes [Kaspersky Secure Mail Gateway]

Problem

Messaged are delayed for 50 minutes and in /var/log/maillog there are following entries:

Dec 10 12:07:07 ksmg KSMG: put to asp quarantine: message-id="": relay-ip="10.10.1.1": action="Postponed": size=21958: mail-from="test@example2.com": rcpt-to="test@example.com"

Solution

This is a a feature which delays some suspicious messages for 50 minutes (by default) and then rescan them with newer bases and information in KSN.

This can be turned off in Settings -> Protection -> Anti-Spam -> Use reputation filtering. The delay can be tweaked in Settings -> Protection -> Anti-Spam Quarantine.

Delayed (quarantined) messages are visible in Message Queue section of KSMG and can be forced to be delivered from there with 'Flush' button.

Which messages to delay or not to delay can be tweaked with bases, so if you get messages that are delayed but shouldn't, then please provide message samples to Kaspersky Support for investigation as 'false positives'.

For KSMG 2.0 - 3.1 (Use Anti-Spam Quarantine and Maximum Quarantine duration options accordingly):