US e-commerce brands generating under 30% of email revenue from flows are leaving the automated income that a correctly built lifecycle system produces on the table

TCPA compliance for commercial SMS requires express written consent that is explicit, voluntary, and specific to the SMS channel. The consent cannot be bundled with email consent — a single checkbox covering both email and SMS marketing does not meet the standard. The consent must identify the brand, describe the type of messages the subscriber will receive (marketing messages, promotional offers), and include a disclosure that message and data rates may apply. The subscriber must actively opt in — a pre-checked box does not qualify. For e-commerce, the standard-compliant method is a dedicated SMS opt-in field at checkout or on a standalone landing page, followed by a double opt-in confirmation text that requires the subscriber to reply YES before they are added to the marketing list.

A TCPA-compliant double opt-in SMS flow in Klaviyo begins with a form or checkout field that collects the phone number and displays the required TCPA disclosure language. When the number is submitted, Klaviyo sends a confirmation text asking the subscriber to reply YES to confirm they want to receive marketing SMS. Until the YES is received, the number is in a pending state and cannot receive any marketing messages. Klaviyo's SMS double opt-in feature handles this natively — the configuration is in the SMS settings within the Klaviyo account under consent and compliance. Attentive's two-tap opt-in is an alternative method that is widely used by US brands for both its compliance robustness and its higher opt-in conversion rate compared to single opt-in.

Klaviyo benchmarks for top-performing US e-commerce brands show automated flows generating 35 to 45% of email-attributed revenue and campaigns generating 55 to 65%. Most brands start with campaigns generating nearly all email revenue and flows generating a small minority. The goal is to grow the flow percentage without reducing the campaign percentage — adding flows does not replace campaigns, it adds a permanently running revenue layer on top of campaign sends. Brands at 15% flow revenue are typically missing 2 to 4 flows from their library. Brands at 35 to 40% have the full flow library built, with post-purchase sequences extending to 4 to 5 emails and VIP segment flows active.

A VIP lifecycle flow in Klaviyo is triggered by a segment entry event — a customer meeting a defined high-LTV threshold such as total spending above $500, 3 or more orders, or average order value above 3x the store's average. The flow begins with a VIP welcome email that acknowledges the customer's relationship with the brand and introduces the VIP benefit (early access, exclusive discount, priority service, or direct contact). Subsequent emails in the VIP flow include an early access notification for new product launches, a dedicated review or testimonial request, and a proactive reorder or gifting recommendation at the brand's average VIP repurchase interval. VIP customers are suppressed from standard win-back and abandoned cart flows that use generic discount language — they receive differentiated messaging appropriate to their relationship with the brand.

Klaviyo offers integrated email and SMS in one platform — the flow builder handles both channels and sending to the same subscriber across email and SMS is managed with suppression logic to prevent duplication. It is the right choice for brands that want a single platform and a moderate SMS programme. Attentive is an SMS-first platform with industry-leading TCPA compliance infrastructure, a proprietary two-tap opt-in, and advanced segmentation built specifically for SMS. It is the right choice for brands where SMS is a primary revenue channel and whose SMS list is large enough to justify a dedicated platform investment. Postscript is a Shopify-native SMS platform with a pay-per-click pricing model and deep Shopify data access. It integrates with Klaviyo so email flows and Postscript SMS flows run in parallel. It is preferred by Shopify operators who want Klaviyo for email and a Shopify-native SMS tool for the SMS channel.