Email Marketing 101: Welcome Series, Flows, and Campaigns

Email marketing remains the highest-ROI marketing channel available to most businesses. It is also the one most businesses underuse. If you are collecting email addresses but not sending regular, well-structured emails, you are leaving money on the table.

Modern email marketing platforms like Klaviyo have made it possible to send the right message to the right person at the right time, automatically. Here is how the system works.

Flows vs. Campaigns

This is the most important distinction to understand.

Flows are automated email sequences triggered by a specific action. Someone signs up for your email list, and they automatically receive a welcome series over the next week. Someone abandons their cart, and they get a reminder email two hours later. Someone makes a purchase, and they receive a thank-you email followed by a review request.

Flows run in the background, 24 hours a day, without you touching anything. You set them up once, refine them over time, and they keep working.

Campaigns are one-time emails sent to a segment of your audience. A new product launch announcement. A seasonal sale. A monthly newsletter. You write them, schedule them, and send them.

The best email programs use both. Flows handle the predictable moments in a customer's journey. Campaigns handle everything else.

Why the Welcome Series Is Your Most Important Flow

The welcome series is the sequence of emails a new subscriber receives after signing up. It is typically three to five emails sent over the first week or two.

This matters because new subscribers are at their peak engagement. They just gave you their email address, which means they are interested right now. The welcome series is your opportunity to introduce your brand, share your story, establish trust, and make a first sale.

A well-crafted welcome series typically generates more revenue per email than any other flow. Yet many businesses either skip it entirely or send a single "Thanks for subscribing" email and stop there.

A strong welcome series looks something like this: Email one arrives immediately and thanks the subscriber, introduces your brand, and delivers any promised incentive. Email two, sent the next day, tells your story or shares your expertise. Email three highlights your best products or services. Email four builds social proof with reviews or testimonials. Email five creates gentle urgency if an incentive is expiring.

Other Essential Flows

Abandoned cart. Someone added items to their cart but did not complete the purchase. A well-timed reminder recovers 5-15% of abandoned carts on average.

Post-purchase. Thank the customer, provide order details, and ask for a review after delivery. This builds loyalty and generates social proof.

Browse abandonment. Someone viewed a product but did not add it to their cart. A follow-up email with that product, sent a few hours later, keeps you top of mind.

Win-back. A customer has not purchased in a while. A re-engagement email with a personal touch or special offer brings them back.

Getting Started

If you are starting from zero, focus on three things in order. First, set up your welcome series. Second, set up abandoned cart recovery. Third, commit to sending at least one campaign per week. These three actions alone will transform your email revenue.

The platform handles the automation. Your job is to write emails that sound like they come from a real person, because they do.