Hey Martin! I think its possible these IP addresses are still configured on an old interface, or are configured as alternative addresses on your primary interface as SmarterMail checks for the presence of those IP addresses in the Windows Registry, and that is generally how they get in there. Can you check that out and let me know if cleaning those up works? Alternatively though you can definitely stop the SmarterMail system service and edit the settings.json to remove them. Please be sure to back up that file beforehand to be safe though!