Here is a list of issues that were fixed in this release - build 2.6.17.

Issue Key Description
AVSUPPORT-33778 Some customers could not add group in a DLP policy. The user checked the option "All Users and Groups", but only 2 lists were displayed. When the user clicked on "Add to exclude" only one group was displayed.
AVSUPPORT-33224 User Reported Phishing was sending many notifications when one report is declined. The admin declined the phishing report, and a notification email was sent to each recipient.
AVSUPPORT-32306 Some emails were not showing when searching in the portal. The emails were redirected to another address that was not covered by email scanning policy. The emails were not properly indexed. A fix was applied to force indexing in these cases.