Klaviyo

For an account holding more than 10,000 profiles, almost always. At that size there is nearly always revenue the account is not collecting, and the audit will show you the gap between what it returns today and what a fully built programme would. If the economics do not stack up for your list, we will say so.

The fundamentals first: deliverability, sending domains, DKIM, and DMARC. Then list health (how much of the list is active, dormant, or about to lapse), segmentation, flow coverage, and how sign-ups are captured through pop-ups and embedded forms. The output is a short written summary of the biggest opportunities in priority order, each with a specific recommendation.

Within five working days. It works with the account as it already exists, no data export or list changes required, and comes back as a ranked list of opportunities with a specific recommendation for each. It runs on its own clock, separate from a migration, so you can commission it whenever you want a clear picture of where the account stands, whether or not a bigger project follows.

A build on its own runs four to six weeks. Migration adds two more phases: first, exporting contacts, suppressions and unsubscribes from the old platform and setting up sending domains, DKIM and DMARC on the new one; then, while we build and test the flow set (welcome, abandoned cart, browse abandonment, post-purchase, win-back), the new sending domain warms up in parallel, sending in gradually increasing volume so it has the reputation to carry the full list at cutover. A large list or one with messy existing data extends the warm-up; a small, clean list moves faster.

Not losing contacts, that part is mechanical. The risk that matters is deliverability: importing the full list and sending to all of it at once, from a sending domain that has no history with any inbox provider yet. Gmail and Outlook read an unfamiliar domain sending in volume as a signal to distrust, and route the mail to junk before anyone reads it, which tanks the exact deliverability the migration was supposed to protect. We warm the new domain up gradually and carry suppressions and unsubscribes across correctly, so the account is healthy from the first send.

There is no single number worth chasing: what matters is trajectory and spread. A well-segmented account sees flow opens sitting well above campaign opens, and a declining trend is a deliverability question before it is a content one. Klaviyo publishes rough benchmarks by industry inside the platform; the audit benchmarks your account against others in your specific category for a sharper comparison.