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> From what I've seen, the email-based way is the primary unsubscription method in use today.

It's not. Most people unsubscribe by clicking a link in the email.

What you're referring to is the list-unsub header which is again a different concept to what the person above you is saying regarding replying to an email and asking to be opted out.

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It may very well be the case that users more often click a link to unsubscribe directly on the site more than they click the 'unsubscribe' feature in the email client (I don't have any stats on that).

The original question remains though: How does the stated service here work when there is only a List-Unsubscribe: header and no web form?

It's illegal (and mostly impossible with most ESP's) to not send a commercial email with a valid unsubscribe link.

If you're receiving email without one you're better off marking it as the spam it is.

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