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Is it possible to automatically add users to one of the lists on Sendy?
And move them from one list to another, after certain time period, or if they do an action?
Sendy has an API so you can do anything with regards to subscribing or unsubscribing.
You can also use Zapier to automate moving of subscribers between lists in Sendy. For example → https://zapier.com/zapbook/zaps/14673/unsubscribe-email-from-one-list-when-its-added-to-another/