Email and retention
A welcome series that earns the second open
The first welcome email is opened because it was expected. The second is opened because the first was worth it. How to build a series around that second open.
By CartKernel · Published
The first welcome email is opened because the subscriber just asked for it. Every email after that is opened because the one before was worth the time. That makes the first message the most important in the series, and its job is not to sell. Its job is to be good enough that the second one gets opened too. Here is a series designed around that second open, from the capture source through to the handoff into regular campaigns.
Start with where the subscriber came from
A signup is not one thing. Record the source at capture and branch on it.
- A popup with an offer. The subscriber wants the code. Intent to buy is real but shallow.
- A popup without an offer, or the footer form. The subscriber is interested in the brand itself. Rarer, and worth more.
- The checkout consent box. They have already bought. Send them into the post-purchase flow, not this one.
- A quiz or product finder. You know what they are looking for. The series should show it.
- A giveaway or partner list. Lowest intent. A shorter series and an earlier move to a low-frequency segment.
- In store or at an event. They have met you. Reference it.
Whether the popup should exist at all, and whether it should carry a discount, are decisions with trade-offs, covered in do exit-intent popups hurt conversion and should you offer a discount for email signup.
Email one: deliver, set expectations, ask one thing
Send it within a minute of the signup.
- Deliver what was promised in the first line. The code, the guide, the early access. Not after a paragraph about the brand.
- Say what comes next, truthfully. How many emails, over what period, and what the regular cadence will be afterwards. Then keep to it. How often should an online store email its list helps set a cadence you can sustain.
- Ask one question. A preference that changes what they receive: category of interest, size, how often they want to hear from you. Store the answer as a profile property and use it from email two onward. One question gets answered; a form does not.
- One call to action. If the offer is the reason they signed up, the button goes to the collection the offer applies to. Otherwise, the button goes to the single most useful page for a new visitor.
The technical checks matter as much as the copy. Send from an authenticated domain with SPF, DKIM and DMARC in place, use a from-name people recognise, point reply-to at an inbox someone reads, and include a one-click unsubscribe header. Gmail’s sender guidelines publish the spam-rate thresholds bulk senders are held to; a new sending domain should warm up gradually before the welcome series runs at full volume.
Email two: why buy here, one or two days later
The second email is where the series is won or lost, so it has to give something. Give the reason the products are different, shown rather than claimed: the material and where it comes from, the way it is made, the fit system, the sourcing, the testing. Photographs of the process beat adjectives about it. If the preference question was answered, the products shown are the ones that match the answer.
Email three: help them choose
Most subscribers have not bought because they do not yet know which product is for them. Guided choice does the work: “if you are starting out, begin with this; if you already use something similar, this one”, a short comparison of two or three products, and a link to the buying guide. Answer the questions that come up before a first order, which for a Canadian or American store usually means shipping times to each country, duties, returns and sizing.
Email four: proof and objections
Reviews from your own review platform, attributed and unedited. Customer photographs with permission. Press coverage only if it exists. Then the top objection from your support inbox, answered directly. If nobody has pulled the top three objections from support in the last quarter, this email cannot be written well, so pull them.
Email five: the offer, or the reason
If the popup promised a discount, the code was delivered in email one, and this message is the reminder with the expiry. If the store does not discount, this is where the reason to act lives instead: the free-shipping threshold, a starter bundle, a gift with a first order. After this message the series ends, and the subscriber joins the regular cadence promised in email one. Subscribers who opened nothing across the series move to a lower-frequency segment rather than the main list, which protects deliverability for everyone else.
Timing and exits
Immediate, then one to two days between messages, with the series complete inside two weeks. Considered categories stretch the gaps; consumables compress them. A purchase during the series exits the subscriber to the post-purchase flow. A second signup from the same address does not restart the series.
Consent and the record of it
In Canada, CASL requires consent for commercial messages, along with sender identification and an unsubscribe mechanism, and the store must be able to show when and how consent was obtained. In the United States, CAN-SPAM requires accurate headers, a physical postal address, and opt-out requests honoured within ten business days. Record the source, timestamp and wording of the consent on the profile at capture, and keep the unsubscribe link in every message including the first. The government pages in the sources set out the requirements.
Measuring the second open
- Open rate of email two relative to email one. The ratio, tracked over time, is the series’ health metric, with the caveat that mail clients prefetch images and inflate opens, so read it alongside clicks.
- Click rate per message. Shows which message carries the interest.
- Unsubscribe rate per message. Identifies the message that loses people. Rewrite that one first.
- Conversion and revenue per recipient within thirty days of signup, by capture source. The popup-with-offer cohort and the footer cohort will differ, and the difference tells you what each source is worth against its acquisition cost.
- List retention at ninety days. How many subscribers from each source are still engaged.
A welcome series that converts on email five but loses a third of the list by email three is not working. The one that earns the second open, and the third, builds a list that keeps buying, which shows up later as repeat purchase rate and lifetime value.
The series at a glance
| Message | Timing | Purpose | One call to action |
|---|---|---|---|
| One | Immediately | Deliver the promise, set expectations, one question | The promised page |
| Two | One to two days | Why the products are different, with proof | A collection matched to the preference |
| Three | Two days later | Help them choose | The buying guide |
| Four | Two days later | Reviews and the top objection | The best-reviewed product |
| Five | Two days later | Offer reminder or the reason to act | The cart |
Which other flows belong alongside it is answered in which email flows should every ecommerce store have, and the email marketing service builds the series from the capture source out.