the appliance, almost crisp expect that i kick wicked to the curve and use systemd-networkd+resolved but that hasn't anything to do with that 😛.
well, most of my modifications are available here but there isn't anything that would change the behaviour of outlook.
what i wonder is if those problems might also be mailbox-related and maybe another/new mailbox does show another behaviour?
i only tested my personal mailbox and the notification-dump (server@) as shared with storeowner here so far.
And i definitely didn't hear anymore from a customer, who was ready to kick grommunio to the curve because of this shit, on which i also ran a test just now with no issues to make absolutely sure 🙉.