Most ecommerce brands start running ads before their email is ready.

It's an understandable sequence the ads feel urgent, the email feels like something you can set up later, and Klaviyo's interface is intimidating enough that "later" keeps getting pushed.

But here's what that decision is actually costing you.

The average ecommerce brand converts 1–3% of its traffic on the first visit. That means for every 100 people your ads send to your site, 97 leave without buying. If you don't have the right email flows in place, those 97 people are gone  and you paid full price to reach them.

Email isn't a nice-to-have that runs alongside your paid strategy. It's the system that makes your paid strategy profitable.

Here's exactly what needs to be live before you turn the ads on.

The flows that must exist before paid traffic goes live

These aren't optional. They're the minimum infrastructure required to run paid advertising without haemorrhaging your acquisition spend.

1. Welcome Series

Trigger: New subscriber joins your list

The Welcome Series is the most important flow in any Klaviyo account. A new subscriber is the warmest lead you have — they've found you, they've opted in, and they're paying attention. What you do in the next 10 days determines whether they ever buy.

A well-built Welcome Series typically generates the second or third highest email revenue of any flow in the account.

What it needs:

• Email 1 (immediately): Brand story, what makes you different, what to expect. No discount in Email 1. Leads that receive a discount before they've built any trust will wait for a discount every time.
• Email 2 (Day 2): Education. Answer the single biggest question or objection about your product category. Build authority before you build the sale.
• Email 3 (Day 4): Product > honest, specific, benefits framed as outcomes.
• Email 4 (Day 7): Social proof. Testimonials, reviews, repeat purchase rates if you have them.
• Email 5 (Day 10): If you have a signup offer, this is when you remind them it's expiring. One CTA. Clear deadline.

The mistake most brands make: Leading with a discount in Email 1 and sending all five emails in three days. Both train your subscribers not to buy at full price and not to read your emails carefully.

2. Abandoned Cart

Trigger: Started checkout, no completed purchase

This is typically the highest revenue-per-recipient flow in any account. Generating 18–25% of total email revenue for brands that have it properly built.

Someone who started checkout has already made a decision. Something stopped them. Your job in this flow is to remove that reason, not re-sell them from scratch.

What it needs:

• Email 1 (1 hour): Simple. Show the cart. One CTA. No discount, no pressure just a reminder. Many of these people were interrupted, not unconvinced.
• Email 2 (24 hours): Address the real objection. FAQs, testimonials, what people wanted to know before they bought. Soft close.
• Email 3 (48 hours): Genuine urgency. If you're going to offer a discount, this is the only place to do it,  first order only, this product only. Never site-wide, never in Email 1.

The mistake most brands make: Offering a discount in Email 1. You are training your customers to abandon their cart on purpose to get a code.

3. Browse Abandonment

Trigger: Viewed a product page, no add to cart, no purchase

Every subscriber who lands on your product page via a paid ad and doesn't add to cart is still showing intent. Browse Abandonment is the flow that catches that signal.

This flow directly amplifies the ROI of your paid traffic. When someone clicks your ad, views the product, and leaves without Browse Abandonment, that click is gone. With it, you have a 3-email sequence following up on exactly what they looked at.

What it needs:

• Email 1 (4 hours): Acknowledge the browse. Surface the product. Top 3 benefits as outcomes, not features. No pressure.
• Email 2 (Day 2): Answer the objection. What do people want to know before they buy this product? Use your reviews to find out.
• Email 3 (Day 5): Social proof. Specific testimonials, before/after experience framing.

The critical setup detail: Exclude anyone who's already in your Abandoned Cart flow. They should only ever be in one flow at a time.

4. Post-Purchase > First Order

Trigger: Completed first purchase

The first post-purchase experience is what determines whether a customer buys again. Brands that invest in this flow see meaningfully higher 90-day repeat purchase rates. Brands that skip it treat every sale like a transaction and wonder why their LTV is low.

What it needs:

• Email 1 (immediately): Order confirmation plus what happens next. Warm, reassuring. Not a sales email.
• Email 2 (Day 3): Usage guide. How to get the best results. Reduces buyer's remorse, increases perceived product quality.
• Email 3 (Day 7): Check-in. Human tone. Invite questions. No sell.
• Email 4 (Day 14): Testimonials at the 2-week mark. Normalise the timeline of results.
• Email 5 (Day 28): Ask for a review. Soft mention of replenishment, their supply is likely running low.

The mistake most brands make: Not building this flow at all, or building it as a generic "thank you" email with a product recommendation. This flow is about the relationship, not the next sale.

What happens if you run ads without these four flows

You pay for every click twice.

Once to Meta, to get the person to your site. And once again in lost revenue — because without the infrastructure to follow up, the majority of that traffic has no path back to purchase.

For a brand spending $5,000 a month on paid traffic, having these four flows live can be the difference between a 2x and a 4x return on that spend. Not because the ads got better because the system behind them started doing its job.

What to build after the critical four

Once flows 1–4 are live and generating revenue, these are the next to build:

• Winback > customers who haven't purchased in 90–180 days
• TOF Nurture > subscribers who completed the Welcome Series but still haven't bought
• VIP / Loyalty > reward your highest-value customers before they leave
• Replenishment > time-based trigger for consumable products
• Post-Purchase Upsell > repeat buyer cross-sell sequence
• Sunset / Suppression > clean your list, protect your deliverability

These flows protect and grow the customer base you've already built. But none of them matter if the first four aren't in place.

The rule

Flows 1–4 live before paid traffic goes live. No exceptions.

Every day they're not built, you're paying for acquisition with no retention system behind it. The ads are not the revenue engine. The full system is the revenue engine. Ads are just the top of it.

Want the complete setup guide for all 10 flows including full email sequences, subject line options, Klaviyo configuration, benchmarks, and common mistakes? 

The Email Flow Playbook covers everything.
Get it here for $47 AUD.

Or if you want someone to audit what you already have and tell you exactly what to build next book a Growth Strategy Session.