Has there been any ground gained with this? We use CC and Mailchimp, along with our own mailing DB. Mailchimp has webhooks and works flawlessly with keeping our DB updated (and that's a free program too). Having an unsubscribe webhook seems almost necessary for the tools required in keeping multiple lists automatically updated. It doesn't have to do anything amazing, simply run a script on my website with predefined parameters, i.e. e-mail address, list to be unsubscribed from, etc.
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