Email Marketing

There was a long stretch where advertising was the only way a company could speak to a customer twice. Once someone left the site, the options were to wait for them to type the address again on their own, or to pay for another impression and buy them back. Bringing back a person who had already signed up cost about the same as acquiring a stranger.

Marketing meetings kept stalling at the same point. A report would show that 900 of the month's 1,000 signups never returned after the first week, and the only proposal on the table was a bigger ad budget. The company already had the email addresses of all 900 people, and nobody had decided what to send them.

Email took over that job for one reason: the list belongs to the company. Ranking in search results means playing by the search engine's rules, and how many people see a social post is decided by that platform. An email address sits in the company's own database, so a message reaches the people the company chose at the moment the company picked. A path the company controls this way is called an owned channel.

The work runs as a loop — collect addresses, pick who gets the message, write and send it, then read what happened and adjust the next send.

1. Collect addresses. Signup forms, gated downloads, and event registrations are the doors where someone types an address in. Consent to receive promotional mail is captured separately at that moment. Most countries require that opt-in for marketing messages and a working unsubscribe link in every one of them.
2. Split the list. Instead of one message to everyone, the list gets cut by conditions. Send the same walkthrough to a three-day-old account and a one-year-old account and half the recipients are reading something they already know.
3. Write the message. It comes down to a subject line, a body, and one button. Several buttons scatter the clicks and make it impossible to tell what brought people in, so each message carries a single goal.
4. Send. Sends split into two kinds: a campaign a marketer schedules by hand, and an automated message the system fires when a condition is met. Set the condition to "just signed up" or "payment failed" and the mail goes out without anyone touching it.
5. Read the results. The share of messages opened, called the open rate, the share of recipients who clicked a link, how many of those went on to pay or return, and the unsubscribe and spam-complaint rates.

Sitting in front of all of that is deliverability — the share of sent mail that lands in the inbox instead of the spam folder. When that number collapses, none of the others mean anything. If 3,000 of 5,000 messages go to spam, a 40 percent open rate still means only 800 people read it.

The basic tool for turning the loop is the A/B test, which splits an audience and sends each half a different version. Change only the subject line, send to half the list each way, and keep whichever one opened better.

Email turns up wherever a company needs to talk to people whose addresses it already has. Five uses cover most of it.

The first is onboarding: someone signed up but hasn't used the product yet, so a short series of messages goes out over several days in a fixed order. The second is the newsletter, sent on a set rhythm so the product stays in mind. The third is product update announcements. The fourth is winning back people who left — an account dormant for two months gets a summary of what changed while they were gone. The fifth is lead nurturing for sales, where someone who downloaded a report receives case studies over several weeks until they are ready to talk.

One distinction matters here. Receipts, password resets, and notification digests go out in response to something the user did, and they are called transactional mail. They can be sent without marketing consent, but the moment a discount offer is tucked inside one, it becomes a promotional message and the rules change.

Personalization, changing the contents per recipient, is common in this channel. Inserting a first name does less than referring to the feature that particular account has not tried yet.

"This week's newsletter opened at 18 percent. Last week was 31. Let's start with the subject line."

The number nearly halved, so look for the cause in the subject rather than the body.

"That announcement should go out as a push notification, not email. People need to see it right now."

Email gets read hours later, so anything urgent belongs on a faster channel.

"Unsubscribes are up to 0.8 percent. I'm cutting our send volume this month."

The sending frequency has crossed what the audience tolerates, and the fix is fewer messages.

At Pagedeck, Ravi runs this channel. Every week he pulls the free-plan accounts that haven't created a single document in two weeks and sends that list a message that opens with "try making one document." Last month he sent 1,200 messages, 420 people opened them, and 68 came back.

He also stopped a send that week. A failed-payment notice was going out three times a day and driving unsubscribes, so he cut it to once. The volume a company can send is finite, and when low-stakes mail spends it, the messages that matter get pushed into the spam folder.

The first assumption is that sending more produces more. Send volume and click volume usually move together, so it looks that way. But the receiving end has a limit, and past a certain frequency more people stop opening while unsubscribes and spam complaints pile up. Mail providers collect those signals and score the sender, so messages from a flagged address start landing in spam. A program that worked fine at one send a week can go from healthy to invisible two months after moving to three.

The second is reading the open rate as the result. It's the first number anyone sees and it's easy to move, which makes it look like a fine target. Write a sensational subject line and the open rate jumps immediately — then people find a body that doesn't match the promise and close it, leaving every later number where it was. Optimize subject lines against opens for a quarter and you end up with more people opening and no more revenue or return visits. The open rate reports whether the subject worked; the result is whether the action the message asked for actually happened.