Answer on: Newsletter-systems and platform integration using an API
On the 5by5 podcasts I always hear about MailChimp, who have a certain free limit where the service doesn't have any costs (until say 10000 newsletter subscribers or so). The integration should be pretty simple, just make sure you can access the email adresses yourself (or collect them too), just in case you want to use another system or implement your own later on.
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