Email is one of the few kinds of marketing that tells you exactly what happened. A flyer goes out and you never know who read it; an email reports back who opened it, who acted, and who left. This last topic is the short list of numbers worth watching, the housekeeping that keeps your mail landing in the inbox instead of the spam folder, and the permission basics that keep you on the right side of both your customers and the rules.
📊 The three numbers
Your email tool will show you a dozen figures. Three carry almost all the meaning, and none of them is the one most owners quote — how many emails they sent.
| Number | What it is | What it tells you |
| Open rate | The share of people who opened at all | Whether your subject line and sender name are working |
| Click rate | The share who tapped the action inside | Whether the email itself and its one offer were compelling |
| Unsubscribe rate | The share who asked to leave | Whether you are sending too much, or the wrong thing — a spike is a warning |
Watch them as trends, not single figures. A rising open rate means your subjects are earning trust; a rising unsubscribe rate after a run of pure offers is the list telling you to give more and ask less. The number of emails sent, the one people love to report, means nothing on its own — a big send with a poor open rate reached fewer real people than a small one that landed.
🧹 Keep the list clean
A list is not a thing you build once; it is a thing you maintain, and a neglected one slowly poisons your ability to reach anyone. The mail services that run the world's inboxes watch how people treat your email, and they protect their users from senders who look unwanted.
- Remove the truly inactive. Someone who has not opened anything in a very long time is dead weight that drags your open rate down and your spam risk up. Let them go, or try one gentle "still want these?" and then let them go.
- Clean out bounces. Addresses that no longer exist should be dropped; repeatedly mailing dead addresses is a signal that you are not tending your list.
- Make leaving easy. A clear one-tap unsubscribe is not a loss — it is a person removing themselves before they get annoyed enough to hit "spam," which hurts you far more.
The logic ties back to topic 2: a smaller list of engaged people protects your ability to reach everyone else. Every unwanted email you stop sending is deliverability you keep.
⚖️ Permission, briefly
The legal side of email marketing is real, it varies by country, and it is not complicated in spirit. Different places have different rules with different names, and they change, so treat what follows as orientation and check what applies where you operate — this is not legal advice. Almost all of it comes down to a few principles that also happen to be good practice:
- Send to people who agreed. Permission first, which is exactly the honest list from topic 2.
- Make unsubscribing easy and honour it fast. A working, obvious way out in every email, actioned promptly.
- Say who you are. A real sender name and a real physical address in the email.
Do the honest things this course already recommends and you will be close to compliant almost everywhere by default, because the rules were written to stop exactly the behaviour that also wrecks your deliverability. Where the details matter — and they do — confirm the specific rules for your country.
🧭 What you have built
Put the six topics together and you have a channel you own. You understood why email outlasts rented reach (topic 1), built a list of people who genuinely want to hear from you (topic 2), learned to give more than you ask so they keep opening (topic 3), and to write an email that survives the two-second glance (topic 4). You set a few automations running so the right message arrives at the right moment without you (topic 5), and now you read three honest numbers, keep the list clean, and stay on the right side of permission (topic 6). Social platforms will come and go and change their rules. The list is yours, and a restaurant that owns a warm, well-tended list owns the cheapest, most direct line to its own customers there is.