Hello! I have a similar problem... I'm on Kentico 9.0
I have tryed to set this properties by using macro but it doesn't work:
Sender name: {%CurrentUser.FullName|(identity)GlobalAdministrator%}
Can't even save, I get "Please enter sender email in correct format." error
I have the same error trying to set them up on Email marketing - Configuration and in Email marketing - Emails - Content - Show advanced options and UTM tracking settings
Thanks,
Ricardo