About this Add-on
Depending on the content of the header, different approaches of unsubscribing are used (only 1 at a time).
1. If 'List-Unsubscribe=One-Click' is available, an automatic push request is used
2. If there is an email address, an email is prepared for the user to be send
3. If there is a web address, the site is opened within the browser
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