Hi Maras,
To remove appended text subject text in spam message, please navigate to GUI -> Mail policies -> Incoming Mail policies -> Click Under “AntiSPAM”
Change the configuration as per requirements.
It would not be configurable to remove the pre-pended text in subject line while releasing from quarantine. This is because the messages which are released from quarantine are not injected back to mail-queue and hence no content filters or message filters apply to it.
I do not suspect this behavior to have changed after an upgrade as far as I know.
Thanks
Libin Varghese