Unsubscribe rate
Why it matters
It is both a legal number and a health check. Rules such as GDPR and CAN-SPAM require opt-outs to be honoured promptly, and large mailbox providers expect bulk senders to offer an easy one-click unsubscribe. Beyond the rules, a rising rate is an audience saying, plainly, that the emails have stopped being worth opening.
Left unwatched it also does damage. Mailbox providers lower a sender's reputation when enough people leave or complain, and a damaged reputation sends future emails to spam whatever the content.
How to apply it
- Watch the trend for each send and each list, not only the overall average. Benchmarks vary by industry, so compare against your own history first.
- When the rate spikes, look for the specific change: more frequent sends, a new audience, content that drifted, or a stale list.
- Segment the list so people only receive what is relevant. Sending everything to everyone is one of the fastest ways to push the rate up.
- Make the unsubscribe link easy to find. Hiding it moves people from unsubscribing to marking the email as spam, which is far worse.
- Remove people who never open on a regular schedule, instead of waiting for them to leave.
What it is
Unsubscribe rate is the share of people who opt out of your emails after a send. Take the number who clicked unsubscribe, divide by the number of emails delivered, and multiply by 100. If 1,000 emails were delivered and 3 people left, the rate is 0.3 per cent.
It is measured per send, to see how a specific message landed, and over a month, to see the trend. Count it against delivered emails, not sent ones, so bounces do not flatter the figure.
It is different from a spam complaint, where the recipient marks the message as unwanted. Both matter, but a complaint does more damage to your sending reputation than an unsubscribe.
Common mistakes
- Treating a very low rate as proof that all is well. People who stop reading without unsubscribing are not counted.
- Mixing up unsubscribes with spam complaints. An unsubscribe is a polite exit. A complaint is what actually damages sender reputation.
