(1) New "Request Release" Link Format
Links generated during the SMTP rejection will include a 12-character HMAC signature parameter (h) instead of the node hostname.
New format:
https://release.duocircle.com/?msgid=c0723300-d612-11f0-8de9-0242ac120002&h=3d552b2b72
Existing links generated with the msgid+node parameter combination will continue to function for the foreseeable future.
(2) Change to "Accept Release" Process
The "Release blocked email from your DuoCircle Smart Quarantine" notification message (generated when a sender of a blocked message successfully requests release of a message they sent) now includes a 9-character "release code" the recipient must enter to view the release request
Email notification example: 
The link included in this notification has changed: the sequential record parameter (id) has been removed
Old format:
https://release.duocircle.com/?id=12345&token=392864cdd5a011f0b9933deafe714c1c
New format:
https://release.duocircle.com/?token=392864cdd5a011f0b9933deafe714c1c
When accessing this link the recipient will now be required to manually enter the 9-character "release code" included in the release request email notification:
Once the correct code has been entered, the release process proceeds as normal.