For real companies, unsubscribing works and the law is behind it. In the US, CAN-SPAM requires every commercial message to carry a clear opt-out, requires the sender to honour it within 10 business days, and — the part most people don't know — bars them from selling or transferring your address once you've opted out. What it can't do is reduce the number of companies that already have you.
Use the unsubscribe, properly
The rules a compliant sender must follow, from the FTC's own guidance:
- The opt-out mechanism must keep working for at least 30 days after the message was sent.
- They must honour your request within 10 business days.
- They can't charge you, demand personal information beyond your email address, or make you do more than reply or visit a single page.
- Once you've opted out, they may not sell or transfer your address, even as part of a list.
- Penalties reach up to $53,088 per email in violation.
That fourth point is genuinely valuable and almost never mentioned. Unsubscribing from a compliant company doesn't just stop their mail — it takes you out of their onward-sharing pipeline too.
Prefer the header button
Many mail clients show an unsubscribe control at the top of the message, driven by a List-Unsubscribe header. Use that rather than the link in the body: it's handled by your mail provider instead of loading the sender's page, so it reveals less about you.
What promotional email isn't
Two categories get mistaken for marketing and behave differently:
- Transactional mail — receipts, shipping updates, account and security notices. Largely exempt from CAN-SPAM's opt-out provisions, and you generally don't want to stop it. If a company bundles marketing into a receipt, that's a different matter and the marketing part is covered.
- Outright spam — senders you've never dealt with, running campaigns that ignore the law entirely. Unsubscribing here is worse than useless; it confirms a human read the message. Report and filter instead.
Why the volume keeps climbing anyway
CAN-SPAM is an opt-out regime. A company does not need your consent before emailing you — it only has to stop when asked. That one design decision is why the total keeps rising: you're playing defence against an unbounded number of senders, one at a time, and each new signup adds another.
Unsubscribing is also binding only on the sender you asked. If your address was shared with forty other parties beforehand, you now have forty more to work through.
The move that changes the trend
Unsubscribing is reactive by construction: it acts after a sender has already reached you, and it does nothing about how many organisations hold your address.
The complementary step is to control the address instead of the message. Give each company its own, and one that starts producing marketing you didn't ask for can simply be switched off — no ten-day window, no legal framework, no cooperation required. How that works in practice.
Do both: unsubscribe from companies you recognise, and stop giving new ones the address everybody already has.
More: does unsubscribing actually work? · when a company ignores you · newsletters you never signed up for