Email & SMS Marketing for E-commerce Brands

Turn the first order into the first of many.

We build and manage the email flows, campaigns, and SMS that recover lost sales and bring customers back.

Across the brands we work with, email and SMS account for 20-42% of total store revenue.

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Real results. Backed by Klaviyo data.
75+
Brands served
20-42%
Of their revenue from email
90 days
Or we work free
<2 wks
Kickoff to first sends live
Verified partner
Klaviyo Shopify Omnisend

Some of the brands we work with

Revenge X Body Lasora Cloud Nine NotSocks Tuned in Tokyo Drip Nation
The work

The emails those brands actually send.

Real sends from live accounts. Built mobile first, written in your voice, designed around one clear action.

Email campaign design
Email campaign design
Email campaign design
Email campaign design
Email campaign design
Email campaign design
Email campaign design

Drag the row or use the arrows. Hover an email and scroll to read it.Swipe across, then scroll any email to read it.

The problem

Your best customers are already on your list.

Ads get harder to afford every quarter. The people who already bought from you are the cheapest revenue you have, and most brands barely email them.

We fix that side of the business. Not prettier emails. A system that sells to the list you already paid for.

What we do

Four jobs. All of them ours.

You approve the plan. We write, build, send, and report on everything.

Flows and Automation

Welcome, cart, browse, post-purchase, and win-back sequences that sell while you sleep.

Campaigns and Creative

A weekly send calendar, written in your voice and designed to earn the click.

SMS and List Growth

Compliant texts plus sign-up forms that grow the list without hurting conversion.

Deliverability, Testing, Reporting

Inbox placement, list hygiene, monthly tests, and a report that shows real revenue.

Comparison

Why brands choose Knox over other agencies.

Other Agencies

  • ✕ Generic templates, light customization
  • ✕ 4 to 6 week setup before you see results
  • ✕ Report on opens & clicks, not profit
  • ✕ Long-term contracts, hidden fees
  • ✕ Limited accountability on results
  • ✕ Slower turnaround on requests

Knox Retention

  • ✓ Strategy built from your actual customer data
  • ✓ Core flows live in under 2 weeks
  • ✓ Report on profit, LTV & repeat purchases
  • ✓ Monthly contracts, no hidden fees
  • ✓ Performance guarantee in writing
  • ✓ Direct line to your team, fast turnaround
How it works

Three steps. Live in two weeks.

01

Audit

Week 1
  • Read your account: flows, campaigns, list health
  • Find where revenue is leaking
  • Agree the 90-day plan with you
02

Build

Week 2
  • Core flows written, designed, and live
  • Weekly campaign calendar starts
  • Sending reputation protected from day one
03

Improve

Every month after
  • Test subject lines, offers, and timing
  • Add flows as the catalogue grows
  • One report showing revenue and LTV
Case studies

The numbers, straight off the dashboard.

Skincare, supplements and apparel. Every figure below is a screenshot from that client's own Klaviyo account, not a number retyped into a slide.

Klaviyo dashboard for a supplements brand showing $333,099.19 attributed revenue in January 2025, up 1,754% on the previous period
SupplementsPeak season
Supplements brand
$694K in five months, from a standing start

A supplements brand heading into its biggest season of the year with no retention setup at all. The flows went live before the rush, December alone did $366K, and the channel held its level once the season closed.

$694K
January to May
+1,937%
Best month
View case study →
Klaviyo dashboard for a skincare brand showing email driving 42.27% of total monthly revenue
Skincare brandAd dependent
From afterthought to 42% of revenue
42.27%
Of total revenue
+92%
Attributed growth
View case study →
Klaviyo dashboard for an apparel brand showing 27.43% revenue attribution while total store revenue grew 346%
Apparel brandHypergrowth
Store grew 346% in a month. Email kept 27% of it.
27.43%
Of total revenue
+189%
Attributed growth
View case study →
Klaviyo growth overview for an apparel brand showing $693,150.51 total revenue up 465.4% with $117K attributed to email, up 430.4%
Apparel brandFlow rebuild
Email’s share of revenue doubled in 30 days
9.6 to 21.9%
Share of revenue
+430.4%
Attributed growth
View case study →
Our guarantee

No growth in 90 days? We work free.

We put our own time on the line. You carry none of the risk.

Apply for a Free Audit
FAQ

Questions, answered.

What results can I expect in the first 90 days?
Core flows go live in two weeks and start earning almost straight away. By day 90 most clients see a clear lift in email and SMS revenue, which is why we guarantee it.
What if we've worked with an agency before and it didn't work?
You are exactly who we built this for. Most agencies fail on templates and vanity metrics. We research your customers first, report on profit and LTV, and back it with a guarantee.
What's the time commitment on our end?
About 30 minutes a week. We handle strategy, copy, design, build, and reporting. You review and approve.
Which platforms do you work with?
Klaviyo, Omnisend, Mailchimp, Attentive, and Postscript. Not set up yet? We will pick and configure the right one for you.
Is SMS marketing compliant?
Yes. Every SMS program we run follows opt-in consent, quiet hours, and carrier rules (TCPA and CTIA).
Are there long-term contracts?
No. Monthly contracts, no hidden fees. We would rather keep you with results than paperwork.
Get started

Ready to see what your list is actually worth?

Book a free audit. No pressure, just a clear look at your numbers.

Book Your Free Audit Call
30 minutes · Google Meet · Or email us at info@knoxretention.com