Applying patch 267 to SMG 10.6.3 causes the view and release links in spam qurantine notification emails to fail to access the qurantine.
Aug 16 2017 16:29:33 [http-bio-41443-exec-3] [BrightmailDecrypt] ERROR - javax.crypto.BadPaddingException: Given final block not properly padded
In the control center:
The error will be displayed, "Cannot view the message. The message has either been deleted or released."
Apply SMG 10.6.3 patch 268.
Installing and removing patches for Messaging Gateway
If you cannot apply patch 268 immediately, you can disable view and release links in the spam quarantine notifications and add a URL to the control center for users to access the quarantine directly.