Interesting to see that RNZ's 'new' daily mailing list service: https://www.rnz.co.nz/news/media-technology/523427/sign-up-for-rnz-s-free-daily-newsletter-nga-pitopito-korero uses (US proprietary service) Mailchimp. See where http://www.list-manage.com resolves. *big sigh* We could do this all here in NZ using #libre software. It'd be much lower cost, and it wouldn't be using NZ tax-payer funds (and RNZ's pitiful budget) to enrich US shareholders.
here's a case study on a #libre alternative to Mailchimp that I wrote base on our own experience: https://www.irrodl.org/index.php/irrodl/article/view/5763/5600 - search the page for 'Case Study'...
If you want to learn more about that alternative, see https://mautic.org