UDATE: tested on 2 different servers with SM 8776. The issue appears to be related to saving the "Do Nothing" action setting, regardless of what previous setting you came from
Gabriele Maoret - Head of SysAdmins at SERSIS
Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)