A great welcome series should do more than deliver a discount and say hi. It should convert subscribers into customers — and lay the foundation for long-term loyalty.
But building that kind of flow from scratch is time-consuming. Especially if you’re running campaigns every week or juggling multiple launches.
Here’s the good news: if you’ve been sending emails for a while, you’re sitting on a goldmine of content — and you can use it to fully automate your welcome series (and make it work harder).
This is a strategy we’ve seen work across industries, and it’s surprisingly simple once you set it up.
Let’s walk through it.
Your welcome series is one of the most important email flows in your entire setup. It’s where subscribers form their first impression, get their first offer, and decide whether they’ll stay engaged — or ghost you forever.
The first 3–5 emails usually cover:
And ideally, that’s enough to convert someone into a first-time buyer.
But if they don’t convert? That’s where most brands drop the ball — folding people straight into their regular campaign list and hoping for the best.
There’s a better way.
Let’s say your current welcome flow is 5 emails long. Instead of stopping there and moving people into your general list, you can automatically continue the conversation — using your past campaigns as the content.
Here's the process:
Start by pulling data from the last 90 days of campaigns inside Klaviyo.
Find your average open and click rates, then scan for emails that performed above average — especially ones with strong open rates and engagement (clicks, replies, or conversions).
Not every high-opener will be a keeper — but they’re a good place to start.
Here’s the catch: your welcome series runs year-round. That means you can’t drop in emails that are time-sensitive or tied to specific events — like seasonal sales, product launches, or date-specific promotions.
Instead, look for emails that offer educational value, brand storytelling, or insightful content — the kind that still makes sense whether it’s January or July.
Bonus points if they already led to conversions. That’s a sign they resonated.
Once you’ve shortlisted a few good emails, head into Klaviyo and:
You can add as many as makes sense. We’ve seen brands extend their welcome flow to 8–12 emails this way — with zero extra content creation.
And yes, you can set conditions to remove people from the flow as soon as they purchase.
Want to see how this fits into a broader automation strategy? Check out our post on email marketing automations — it covers more ways to reduce manual work while improving results.
This strategy isn’t just efficient. It’s effective.
You’re doing three smart things at once:
You’re also reinforcing your brand voice and key messages — which builds trust, even if someone doesn’t buy right away.
And if you’re still writing new campaigns every week, this strategy helps reduce fatigue. Less time starting from scratch. More time spent scaling what already works.
A lot of brands hesitate to reuse content in automations, thinking “Everyone’s already seen this.” But the truth is: your welcome flow subscribers are new. They’ve never seen those past emails. To them, it’s fresh.
And if the content worked once — it’s likely to work again.
The only thing to be careful with? Don’t overload your welcome flow. Space things out, keep it clear, and make sure every email still serves a purpose.
Not sure which emails are worth reusing? We can help you dig into the data, or build a welcome series from scratch. See why brands trust In-Box to manage flows that actually convert.
To recap, here’s how to automate your Klaviyo welcome series using past campaigns:
Done right, this strategy gives you months of follow-up content — without burning out your team or your subscribers.
For more practical ways to optimize your email marketing, head over to the In-Box Insights blog. We share proven strategies, real-world examples, and helpful breakdowns every week.
Or if you’re ready to build a smarter welcome series? Let’s chat.
