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While public-inbox is intended primarily for archival,
SMTP list subscriptions are still in use in most places
and users are likely to want a good unsubscribe mechanism.
HTTP (or HTTPS) links in the List-Unsubscribe header are
often preferable since some users may use an incorrect
email address for mailto: links.
Thus, it is useful to provide an example which generates an
HTTPS link for users to click on. The default .psgi requires
a POST confirmation (as destructive actions with GET are
considered bad practice). However, the "confirm" parameter
may be disabled for a true "one-click" unsubscribe.
The generated URLs are hopefully short enough and both shell
and highlighting-friendly to reduce copy+paste errors.
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