Hello Sébastien, sorry to hear you're having trouble with this! These settings have been around for some time now, but we did move their placement recently. That being said, the default would be never so I think we likely need to get a settings backup from you from before your most recent upgrade to see if we can reproduce the change in-house. I can get a ticket started on this and we can dig into it together.
Kyle Kerst
IT Coordinator
SmarterTools Inc.
www.smartertools.com