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Go to Mailchimp and create an account.
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Create a new list in Mailchimp https://us20.admin.mailchimp.com/lists.
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Go to Account -> Extras -> API keys https://us20.admin.mailchimp.com/account/api/.
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Copy API key and paste to Admin -> Settings -> Newsletter -> Mailchimp API key.
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Copy List ID and paste to Admin -> Settings -> Newsletter -> Mailchimp List ID, then click Save. Or just click Save setting, and it will auto get List ID.
