tmailrPrivacy
What actually happens when you press unsubscribe
21 July 2026 · 2 min read · TMailr
You press unsubscribe and the mail stops, or it does not. What happens in between depends on which of three quite different mechanisms your client used, and knowing which explains most of the cases where it appears not to work.
One-click, the way it should work
A well-configured sender includes two headers. Your mail client reads them, shows a native unsubscribe button, and when you press it sends a request directly to the sender. You never leave your inbox and no page loads.
List-Unsubscribe: <https://example.com/u/abc>, <mailto:u@example.com> List-Unsubscribe-Post: List-Unsubscribe=One-Click
Both headers are needed. With only the first, the client cannot act on your behalf and falls back to opening the link, which is the friction one-click exists to remove. Gmail and Yahoo now require both from bulk senders, which is why this has improved noticeably since 2024.
The link in the footer
The older path: a link at the bottom that opens a page. It usually works, and it has two problems. The link identifies you, so following it confirms your address is live and read, which for a genuine spammer is exactly the information they wanted. And the page frequently asks you to sign in, or presents a preference centre with eleven checkboxes, which is a dark pattern rather than an accident.
For mail from a real company you have a relationship with, use it. For mail from somebody you have never heard of, do not: you are confirming the address.
Marking it as spam
This does not tell the sender anything. It trains your provider’s filter and, at volume, damages the sender’s reputation with that provider. It is the right response to actual spam and the wrong one for a newsletter you signed up for and forgot, because the sender never learns to stop and the complaint counts against them anyway.
Why it sometimes seems not to work
- The rules allow a short window to process it, so a message already queued still arrives.
- You unsubscribed from one list and the company has several.
- The mail is transactional, which unsubscribe does not cover and should not: receipts are not marketing.
- The sender is ignoring it, which is a legal problem in most places and a reputation problem everywhere.
Where an alias changes the calculation
If you gave that sender an address of its own, you do not have to negotiate. Switch the alias off and the mail stops at the door, permanently, with no page to visit, no preference centre, and no confirmation to the sender that anybody was reading. It is the only unsubscribe that does not depend on the other party cooperating.
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