> For those of you senders who are interested in this feature, the most basic requirements are including a standard "List-Unsubscribe" header in your email with a "mailto" URL
Do they support HTTP URLs in the List-Unsubscribe header yet? Last time I checked, the mailto URL was the only one they supported, despite the fact that RFC 2369 clearly includes an HTTP option. It would be so much easier if website developers could simply reuse their existing unsubscribe link, instead of having to monitor a special e-mail account. And yet nobody seems to support the HTTP URL option.