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Turn Your Email List Into Predictable Revenue With Email & SMS Retention

InboxShuttle builds and manages email and SMS retention systems for ecommerce brands doing $75k+ per month. Most brands we work with see retention become one of their top revenue channels within 90 days.

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Brands that trust us
Services

Email and SMS systems built to increase repeat revenue.

01
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Strategy & Planning

Full lifecycle audit and a 90-day roadmap built around your email retention strategy to increase repeat purchases and LTV. No guesswork. Only structured, data-driven plays.

02
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Email & SMS Design

Conversion focused email and SMS built for clicks and repeat purchases. On brand, high converting, and designed to scale with your store.

03
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Lifecycle Execution

Weekly campaign management, flow optimization, and deliverability protection. Everything runs consistently so your retention channel keeps generating revenue.

04
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Testing & Optimization

Structured A/B testing, segmentation refinement, and continuous optimization. Every cycle improves performance and compounds results.

Included in every plan
✓ ESP setup & management
✓ Copywriting & design
✓ Flow builds & optimization
✓ List health & deliverability
✓ Segmentation strategy
✓ Regular strategy calls
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How It Works

How We Build Your Email and SMS Retention System

A structured process designed to build, launch, and continuously improve your retention channel.

01
Week 1

Strategy & Audit

We audit your ESP, flows, and customer data, then build a 90-day retention roadmap tailored to your brand.

Full ESP audit 90-day retention roadmap Flow gap analysis
02
Weeks 2–3

Build & Launch

We write the copy, design the emails, build the flows, and configure segmentation. Core lifecycle flows such as welcome, abandoned cart, post-purchase, and win-back are implemented and ready to run.

Core flows built Campaigns scheduled Segments configured
03
Week 4 onward

Optimize & Compound

We run structured tests, refine segmentation, and improve timing and offers based on performance data. Over time the system becomes more effective as we learn from each campaign and flow.

Weekly sends A/B testing cycles Monthly reporting
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Who We Work With

Here’s who we’re a fit for, and who we’re not.

We partner with brands where we believe a structured retention system can create real revenue impact.

✗  This is not for you if…
✕
You’re doing under $75k/month. The ROI of a full retention system usually isn’t there yet.
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You want a one-off project or a “test month.” Retention is infrastructure, not a sprint.
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You’re looking for the cheapest option. We focus on long-term return, not the lowest price.
✕
You want to blast discounts every week. That’s margin erosion, not retention strategy.
✕
You’re not ready to share ESP access and performance data. We need visibility to do the job properly.
✓  This is for you if…
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You’re doing $75k–$500k+/month and email is generating less than 25% of revenue.
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You know retention matters but haven’t had the time or team to build it properly.
✓
You’re tired of relying only on Meta and Google for growth.
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You want a partner focused on LTV, margins, and repeat purchases, not just opens and clicks.
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You’re ready to invest in a system that improves over time.
Our Commitment

We don’t win unless you do.

If you’re not seeing meaningful revenue progress after 90 days of full execution, we keep working at no extra cost.

90
Day
Commitment
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Full execution for the first 90 days before we evaluate performance
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If there is no meaningful progress, we continue working at no extra cost
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No hidden clauses. Clear accountability.
✓
We stay intentionally small so every client gets proper attention
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Pricing

Strategic retainers for brands serious about retention.

Every plan includes full email and SMS lifecycle strategy, creative, and execution. No project fees. No surprises.

Foundation
$3,000 / month

For brands that need the retention fundamentals built properly.

  • 6–8 emails per month
  • Core lifecycle flows implemented (welcome, abandoned cart, post-purchase)
  • Foundational customer segmentation
  • Email copywriting and design
  • Monthly performance reporting
Capture repeat revenue your brand is currently leaving on the table after the first purchase.
Most Popular
Growth
$5,000 / month

For brands ready to turn email into a consistent revenue channel.

  • 10–12 emails per month
  • Everything in Foundation
  • Advanced lifecycle flows (browse abandonment, win-back, sunset)
  • Testing and campaign optimization
  • Segmentation based on purchase behavior
  • Bi-weekly strategy call
A lifecycle system that generates revenue between launches without relying on constant promotions.
Full Retention
$7,000 / month

For brands ready to scale retention across email and SMS.

  • 14–16 emails per month
  • Everything in Growth
  • Full lifecycle audit and rebuild if needed
  • Advanced behavioral segmentation
  • SMS integration and strategy
  • Weekly reporting and strategy call
Retention becomes a reliable growth channel driven by repeat customers and lifecycle automation.

All plans require a 3-month minimum commitment.

FAQ

Clarity before we work together.

Direct answers before we work together.

Who is InboxShuttle a good fit for?+
We partner with ecommerce brands doing $75k+ per month that want retention to become a meaningful revenue channel. If your goal is stronger repeat purchase rate, higher LTV, and more consistent email revenue, we’re likely a good fit.
How quickly will we see measurable revenue impact?+
Some improvements can appear early as flows and campaigns go live. In most cases the strongest lift happens over 60–90 days as the retention system matures and optimization compounds.
How do you measure success?+
Revenue comes first. We track flow revenue growth, campaign revenue per recipient, repeat purchase rate, LTV, and deliverability health. Open rates are directional. Revenue and retention are the real scorecard.
Why are your retainers structured this way?+
Our work focuses on building and optimizing a complete retention system, not sending isolated campaigns. Performance improves as flows, segmentation, testing, and campaign strategy work together over time.
Is there a minimum commitment?+
Yes. All engagements require a 3-month minimum. Retention systems compound over time. Most brands see the strongest results once flows, campaigns, and segmentation are running together as a cohesive system.
What makes InboxShuttle different from other email agencies?+
Many agencies focus primarily on sending campaigns. We design and optimize a full retention system across welcome, abandoned cart, post-purchase, and win-back flows, then continuously improve performance through structured testing.
Which platforms do you work with?+
We primarily work with Klaviyo, the industry standard for ecommerce email and SMS. We can also support brands using Omnisend, Drip, and other ESPs. If you’re not yet on Klaviyo, we can help with the migration.
Do you work with brands outside ecommerce?+
Our focus is ecommerce brands where retention systems have the biggest impact. Most of our clients run on Shopify and sell physical products with repeat purchase potential.
Do you replace our internal marketing team?+
No. We typically work alongside founders, growth leads, or marketing teams and take full ownership of the retention channel.
What do you need from us to get started?+
We typically need access to your ESP (such as Klaviyo), historical campaign and flow data, and basic visibility into store performance. Retention systems work best when we can analyze customer behavior, purchase patterns, and existing lifecycle performance before building improvements.
What happens after I apply?+
We review every application to make sure we can create meaningful impact for your brand. If it looks like a strong fit, we’ll invite you to a 25-minute strategy call to walk through your retention opportunities and next steps.
Ready to turn retention into a real revenue channel?

If retention is becoming a priority and you want a structured system behind it, we can help.

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Apply to Work With Us

Tell us about your brand. We’ll see if we’re a fit.

Tell us a bit about your brand and your current retention setup. If it looks like we can create meaningful impact, we’ll invite you to a 25-minute strategy call to walk through your retention opportunities.

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Takes about 2 minutes to complete
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We review every application personally
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Qualified brands get a 25-minute strategy call
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Response within 1 business day
We keep our client roster under 10 brands at a time. When we’re full, we’re full.

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We review every submission and respond within 1 business day.
We only take on brands where we believe we can create real impact.

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Application received.

We review every submission personally. If we think we’re a good fit, you’ll hear from us within 1 business day.