Black Friday Email Marketing 2026: Start in September, Send More in the Week That Pays 3x

Every October I send my team the same reminder: if you haven’t said the words “Black Friday” to your ecommerce clients yet, say them today. By the week of Thanksgiving, everything should already be scheduled. It’s October as I write this, so consider this post your reminder too, with the data behind it.

Black Friday doesn’t happen for a lot of brands without email and SMS. It is announced, reminded, extended and closed by email and text, and the numbers show it. On the Klaviyo stores we manage, the week of Black Friday 2025 was the single best week of the year for campaign email, and not only in total: every individual email earned more than it does in a normal week, and unsubscribes didn’t move. That is the opposite of the “ease off so you don’t burn the list” advice I still hear every September.

I haven’t had a Black Friday off in over 10 years. Nothing gets built that day, because everything is scheduled weeks before. I’m there to watch the numbers and answer last-minute questions, so our clients don’t have to do anything on the day itself. Every December my team also runs a “best and worst of BFCM” show-and-tell of the emails that landed in our own inboxes. It’s my favorite time of year. Here is what the data and those reviews say actually works.

The short answer: start in September, send more than you think in Black Friday week, and stop adding sends once December arrives. That week, every extra email earned more than a normal one, and unsubscribes didn’t move. By mid-December, extra sends earned only 0.6 to 0.9 times the usual per email. SMS is even more seasonal: 45% of the past year’s SMS campaign revenue arrived in Q4. The calendar is below, and the Black Friday plan is at the end.

Black Friday week is where extra email pays best

The median store we manage sent 2.54 times its normal weekly campaign volume, earned 3.35 times its normal campaign revenue, made 26% more per email delivered, and saw an unsubscribe rate of 0.99 times normal, which is to say no change at all. Shoppers expect to hear from you that week.

The public data points the same way. Klaviyo’s BFCM 2025 release counted 22.7 billion messages sent over the five days, up 25%, and reported that email and SMS drove 42% of its customers’ total revenue. Adobe measured $44.2 billion of US online spending over Cyber Week 2025 and a record $14.25 billion on Cyber Monday alone. The shoppers will show up either way. What you can control is whether your list, your offer and your inbox placement are ready for them.

One thing GA4 adds: email-driven website sessions at the stores in our data were only 1.16 times an average week during Black Friday week, while email key events (mostly purchases) were 1.33 times. In other words, Black Friday email doesn’t bring many extra people to the site. It turns people who were already planning to shop into buyers.

September and October: build the list and the plan before the rush

Black Friday is won in September and October. For new clients, our cut-off to be ready for Black Friday is onboarding in October, and September is better. A brand that arrives on November 1 and is still in setup can’t execute well, and I’d rather say that up front than overpromise. What those weeks are for:

• Grow the list on purpose. Switch your signup forms to holiday wording from October (“The best deals are still waiting for you. Sign up for early access to our holiday sale.”). The median popup we run converts 3.1% of viewers and exit-intent forms 5.6%, and every subscriber you add in October is one you can email in November without paying for the click again. Our list building guide covers the settings.
• Collect SMS consent now, even if you won’t send texts until the sale. Asking existing email subscribers to add their number converted more than 20% of viewers in the best cases on our accounts.
• Warm the sending domain. Check SPF, DKIM and DMARC, clean out hard bounces and anyone who has ever marked spam, and widen your engaged segment gradually through October so November’s volume doesn’t arrive as a shock to inbox providers.
• Fix the evergreen flows. Holiday traffic runs through your welcome, cart and checkout flows. Test every discount code and every dynamic block. Last November my team reviewed a big home-goods retailer’s win-back email that arrived with no promo code and no expiration date because a field didn’t populate. It’s an easy miss to prevent with one test send.
• Design the hero emails. The “sale starts” email is what new holiday customers see first. It should be the best-looking email you send all year.

923% Increase in Klaviyo attributed revenueLuxury Slipper Brand Grows Email Revenue by 10xSee the case study →165% Increase in Klaviyo attributed revenueSignage & Printing Brand Grows Email Revenue by 165%See the case study →

The send calendar from November 1 to Cyber Monday

This is the shape we run for a typical store with a two-to-three-day sale, adjusted to each brand’s margins and catalog. It keeps the bookends unmissable and the reminders aimed only at people who haven’t bought.

1. Early November: a gift guide or “what’s coming” email to the engaged list, and a signup push for early access.
2. The week before: early access for VIPs and SMS subscribers, a day or two ahead of everyone else. It rewards the people who carry the account without deepening their discount.
3. Thanksgiving Day: email only, if anything. A client once wanted to send a text on Thanksgiving. I asked whether they’d want to receive one on Thanksgiving. They said no. So we didn’t, and sent an email instead, because you can ignore an email.
4. Black Friday: “sale starts” by email and SMS, with Smart Sending turned off. There is no higher-priority message in the calendar year.
5. Saturday and Sunday: reminders that exclude everyone who already bought, plus a different angle (bestsellers, a category, a bundle) instead of the same email again.
6. Cyber Monday: a fresh hook and the “sale ends” bookend, by email and SMS, Smart Sending off again.
7. Early December: shipping-deadline emails (“order by Thursday to get it by Christmas”), which consistently outperform another discount reminder.

The exclusion segment is the part most brands skip. I build a segment of everyone who converted during the sale and remove them from the reminders, so they only get the bookends. We’ve already won them; we don’t need to win them again three days later. And if anyone ignored the first two reminders, they go into a fatigue shoppers segment and sit out the rest. The email frequency post in this series has the full data on why more sends to engaged readers don’t raise unsubscribes.

After Cyber Monday the curve flattens, so shift from more sends to better ones

Cyber Monday week still pays: 1.93 times the usual sends for 1.92 times the revenue, so each extra email earns about what a normal one does. By mid-to-late December, extra sends earned only 0.6 to 0.9 times the usual per email, and unsubscribes started to creep up (0.9 to 1.3 times normal). The fatigue that people worry about in November shows up in December instead.

So December is when the calendar shifts gears. Shipping deadlines, gift cards for the last-minute crowd, and the new-customer work. Black Friday brings a lot of first-time buyers, and some of them are holiday-only shoppers. A post-holiday warm-up flow (a thank-you, how to get the most from what they bought, then a reason to come back in January) is how holiday customers become your customers. Retention is where email does its best work, and the post-purchase email guide in this series lays out that flow.

The offer: give your best of the year, but not to everyone

I’m the “stop over-discounting” voice most of the year. Black Friday is the exception. If your margins can take it, I suggest going 5 to 10% beyond the best discount you ran during the year. Holiday shoppers comparison-shop hard, and the best, clearest offer wins them. Our subject-line data backs up being direct about it: subject lines that named an offer earned 17% more per email than the account average, with identical opens.

Two guardrails. First, your champion customers, the ones who buy frequently, recently and spend the most, don’t need an extra discount to convert. Give them early access and first pick instead. Second, keep the urgency real. Two or three day sales give people time to decide and tend to convert better than one-day flash sales. And nothing burns trust like “sale ends tonight, sale ends tonight, sale extended”. As a shopper, if I’d already bought and then got the extension email, I’d feel taken for a ride. Our data agrees in its own way: subject lines built on urgency wording got 18% fewer clicks.

And if your brand doesn’t discount at all? That’s a legitimate choice, especially for luxury brands. Send before or after the weekend, not into the noise, and send a gift guide. You can be promotional without having a sale.

SMS on the day: your most seasonal channel

SMS is built for exactly this weekend: short, urgent, high-value news that people want to act on right now. On a fixed set of stores we manage, 44.7% of the past year’s SMS campaign revenue (September 2025 to August 2026) came in Q4, against about a third for email campaigns, flows and the stores’ total revenue. In November alone, SMS campaign revenue ran at 2.56 times an average month.

Public data says the same. Klaviyo reported text revenue up 25% over BFCM 2025, and Attentive’s Cyber Week 2025 release counted 5.7 billion messages, up 46%, and nearly $2 billion of revenue for its brands across SMS, email and push. In Black Friday week, the SMS stores we manage sent 2.84 times their normal volume and earned 3.38 times their normal SMS revenue.

The texts that earn over the holidays are the ones that know who already bought. If your SMS lives on a separate platform from your email, every text tends to go to everyone, buyers included; putting SMS on the same profiles and flows as email is the biggest single fix, and the time to make it is September, not the week of the sale. Keep the per-message math in view, too: on the stores we manage, a text earns about 1.19 times an email in the same store, so its job is the urgent moments, not extra volume. For the weekend, send incentivized, time-sensitive texts only, and none on Thanksgiving. Keep them between noon and 8pm in the subscriber’s local time. That window keeps you clear of state quiet-hour rules. Texas, for example, has treated marketing texts like telemarketing calls since Senate Bill 140 took effect on September 1, 2025, which means no texts before noon on Sundays or after 9pm on any day. Our SMS marketing team sets this up inside the same flows as email.

Deliverability: plan the dip, then run the recovery

When a brand doubles or triples its normal output and reaches 80 or 90% of its list, its deliverability score takes a hit. That’s expected, and I tell clients in October, not in December: our deliverability is going to dip over the next two months, and what I’m going to do is make sure it doesn’t drop below the margin where emails stop hitting the inbox. On one beauty brand we manage, the score dipped about five points over the holidays while we increased sending volume by 20%. That’s a dip we planned for and could afford.

Two settings protect you. Keep spam complaints under Google’s 0.1% guideline (Gmail has been rejecting non-compliant bulk mail since November 2025), which mostly means not mailing people who stopped engaging a year ago. And plan “reputation recovery” for January: back to the tightest engaged tiers for a few weeks, flows carrying the revenue, and a gradual widening again once the score is back in the 70s and 80s. Our deliverability guide has the full checklist.

The Black Friday email marketing plan for 2026, in order

1. Lock the offer and the calendar by mid-October. Best offer of the year if margins allow, a two-to-three-day window, and every send scheduled by the week of Thanksgiving.
2. Switch signup forms to holiday wording and ask for SMS consent now. Every October subscriber is a free November audience.
3. Prepare the domain. Authentication checked, bounces and spam complainers suppressed, engaged tiers widened gradually through October.
4. QA every flow and code. Welcome, cart and checkout flows carry holiday traffic; test the discount codes and dynamic fields.
5. Give VIPs early access instead of a deeper discount.
6. Send more in Black Friday week, aimed well. Bookends to everyone with Smart Sending off, reminders only to non-buyers, a fresh angle each day.
7. Use SMS for the moments that matter. Early access, sale starts, final hours. Noon to 8pm, never on Thanksgiving.
8. Shift gears in December. Shipping deadlines and gift cards instead of more discount reminders, then a warm-up flow for holiday first-timers and a January reputation recovery.

If you’re reading this in October, there’s still time to do all of it, as long as you start this week. Pick the offer, book the calendar, check your forms, and look at your engaged segment size so you know what you’re working with. If you’re running paid alongside email, our PPC team can cover the other half of the weekend. And if you’d like my team to look over your holiday plan before it goes live, we’d love to help.

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