Email Flows

Definition

An email flow is a multi-step automated email sequence triggered by a specific subscriber event, action, or condition. The term "flow" is most closely associated with Klaviyo, which distinguishes flows from campaigns as its primary sending paradigm, but the concept exists across virtually all modern email marketing platforms under names such as journeys, automations, or workflows. A flow consists of three elements: a trigger (what starts the flow), filters (who enters the flow), and actions (what happens, including email sends, delays, splits, and conditional branches).

Common flow types include welcome series (triggered by subscription), browse abandonment (product page views without purchase), cart recovery (add-to-cart without checkout), post-purchase follow-up (order placement), and winback sequences (prolonged inactivity). Each maps to a specific lifecycle stage and uses different success metrics. Welcome flows are measured by activation rate and first-purchase conversion; winback flows are measured by re-engagement rate and churn reduction.

In Klaviyo's architecture, campaigns are single sends to a chosen segment at a chosen time, while flows are event-driven, always-on sequences that execute independently for each subscriber. Klaviyo's benchmark data shows flows consistently outperform campaigns, with welcome flows generating 5x more revenue per recipient than broadcast campaigns in many ecommerce verticals.

Best Practices

• Design flows with a single, measurable objective per sequence. A welcome flow should drive first-purchase conversion, not also attempt cross-sells and upsells. Keep the focus narrow and measure the flow against that primary goal.

• Use flow filters to prevent subscribers from entering the wrong sequence or overlapping with contradictory flows. For example, a browse abandonment flow should check that the subscriber has not already purchased the viewed item and is not currently active in a cart recovery flow.

• Implement delay steps strategically. The first email in a welcome flow sent immediately after sign-up performs well, but subsequent emails should space out at intervals of 24–72 hours to avoid overwhelming new subscribers.

• Add conditional splits based on engagement behaviour. If a subscriber clicks a link in email two of a five-step flow, consider skipping to the conversion-oriented final email rather than sending the remaining intermediate messages.

• Monitor flow-level analytics including completion rate, conversion rate, revenue per recipient, and time-to-conversion. Use these metrics to identify drop-off points where subscribers exit the flow or stop engaging.

• A/B test flow architecture changes incrementally. Test single variables such as trigger timing, email count, or subject lines before restructuring an entire sequence. Flow tests accumulate data rapidly because triggered sends occur continuously.

Frequently Asked Questions

What is the difference between a flow and a campaign in Klaviyo?

A campaign is a one-time or recurring send to a selected segment at a scheduled time. A flow is an automated, event-triggered sequence that runs continuously and independently for each subscriber. Flows respond to behaviour; campaigns respond to a calendar.

How do I choose between building a flow and using a campaign?

Use flows for repetitive, behaviour-driven communication such as welcome series, cart recovery, and post-purchase follow-up. Use campaigns for time-sensitive announcements, newsletters, product launches, and seasonal promotions that target a defined audience at a specific moment.

Can a subscriber be in multiple flows at the same time?

Yes. A subscriber can be active in several flows simultaneously. For example, a new subscriber might be in both a welcome flow and a birthday flow. Use flow filters and priority rules to manage overlap and prevent contradictory messaging.

How often should I review and update my flows?

Review every flow at least quarterly. Check that trigger conditions still align with current site behaviour, that offers and copy remain relevant, and that flow metrics meet performance targets. Retire flows that no longer drive meaningful engagement.

What metrics matter most for flow performance?

The most important flow metrics are conversion rate (percentage of entered subscribers who complete the desired action), revenue per recipient, flow completion rate, and time-to-conversion. Secondary metrics include open rate, click-through rate, and unsubscribe rate within each step.