Solved Add support for One-Click E-Mail Unsubscribe Header

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Kirby

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XenForo currently implements (automatic) unsubscribe via mailto in header List-Unsubscribe.
This allows users to easily unsubscribe from admin-emails by clicking the unsubscribe link in supporting email clients, this generates an email that XenForo can automatically process to unsubscribe the user.

RFC 8058: Signaling One-Click Functionality for List Email Headers is a specification that anhances the functionality of List-Unsubscribe by specifying another header...

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