I have a simple rule for email that I don't want. If there is a way to easily opt-out (clicking a link, replying with "unsubscribe", or (in rare cases) filling out my email address on a form) I will do that. I should also set a rule for that sender saying "opted-out" so I can know if they aren't respecting that. If I can't do any of those things, I mark it as spam and move on. I don't care about the negative impact to your future emails by getting spam reports in Gmail. It doesn't concern me. Let me unsubscribe easily and legally.
> 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.