Hi Brigitte,
We use SendHQ which is a custom platform created for us by our agency. It works the same as Mailchimp and Campaign Monitor. Subscriber lists are linked to our current student/parent platform (Edumate) and syncs every night. From the same platform, we can build out the newsletter – we created a standard template to ensure consistent branding etc.
Our newsletters are managed by marketing only so there’s greater control and consistency.