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This may require a custom API development, but I thought I would ask.
I would like to send an e-mail to current customers inviting them to join a second e-mail list.
I imagine sending a link like this: firstname.lastname@example.org
The "magic" page adds the e-mail "email@example.com" to the second Sendy list, and displays a confirmation page
Is something like this possible?
Yes that's possible.
Your URL in your HTML code should look like this:
Then in your 'magic' script, subscribe the email to the list via the 'subscribe' API https://sendy.co/api