Maybe I've missed something, but where have the settings for the system-generated emails gone?
https://enhance.com/docs/platform/system-generated-emails.html
GoSuccess System generated emails are now handled by system MTA, there are no settings currently present in v12 for that, only the general email settings are there..
open ticket with support Adam will help you out..
Since v12 you now set these on your control panel server. Go to the server, 3 dots up top right, email settings.
Thanks xyzulu and pratik_asabe , I have now simply used the Smart host settings on the control panel. Now it works again as it should. 🙂