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Klaviyo Email Marketing Agency - Letterbox Media

Email & SMS Marketing Agency

FOR BRANDS THAT CARE ABOUT THE SECOND PURCHASE

Letterbox Media is an email marketing and SMS marketing agency helping ambitious founder-led, family-owned and women-owned ecommerce brands grow beyond the first purchase.

CURRENTLY ACCEPTING 1 NEW CLIENT FOR Q4 2026

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EMAIL MARKETING • SMS MARKETING • RETENTION STRATEGY • OMNI-CHANNEL MARKETING • EMAIL CAMPAIGNS • REVIEWS & LOYALTY STRATEGY • WHATSAPP MARKETING •

What happens when we get involved:

1,900%

Email revenue growth · children's furniture · 5 months

£30.6K

Email revenue · food brand · 6 months

3×

Email revenue · luxury pet brand · 90 days

1,741%

Subscriber growth · sustainable fashion brand

Email is the only channel where your brand speaks directly, without algorithm interference, to someone who chose to hear from you.

WHY LETTERBOX MEDIA

You didn't build your business by following a template. Your marketing shouldn't feel like one either.

We work with ambitious independent ecommerce brands that care about what they're building  and want a smarter way to grow the customer relationships behind it. 
 
We don't hand you off to a project manager who doesn't care. You work directly with our Founder. 

What we're good at:

Email
Marketing

Strategic email marketing campaigns that strengthen customer relationships, support launches and drive repeat revenue.

SMS
Marketing

Timely SMS marketing that complements your email strategy and creates another thoughtful touchpoint.

Omni-Channel
Marketing

Unifying all your marketing channels from Email, SMS, WhatsApp right down to your Instagram for advanced data-driven campaigns.

Email
Automations

We audit your customer journey, identify missed opportunities and build a roadmap for stronger email, SMS and lifecycle marketing.

What Our Clients Say

Trusted by Global E-Commerce and DTC Brands

"I have a social enterprise with very specific needs, it is quite a complex business. Letterbox Media worked with me on our Klaviyo flows. I thought at first that it would be just technical advice for best practice, but it was FAR more. They helped us with brand messaging, graphic assets and their copy was much better than ours! The flows have been incredibly successful for us. I cannot recommend Letterbox Media highly enough and will be doing more projects with them."

Kelly B., Founder

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Deep Dive Into How We Tripled Email Revenue For Multiple Businesses

Home Good and Furniture

Children's Furniture Brand

How we transformed a children’s furniture brand from a basic Shopify email setup into a high-growth retention engine, resulting in a 1,900% increase in email-attributed revenue in just five months.

Read Case Study
How we transformed a children’s furniture brand from a basic Shopify email setup into a high-growth retention engine, resulting in a 1,900% increase in email-attributed revenue in just five months.

FMCG (Food)

Nutritious Food Brand

See how in just 6 months, we helped this food brand generate £30.6K in email revenue—surpassing their entire 2024 total of £23.1K and growing their list by 241.46%.

Read Case Study
See how in just 6 months, we helped this food brand generate £30.6K in email revenue—surpassing their entire 2024 total of £23.1K and growing their list by 241.46%.

Pet Industry

Luxury Pet Products Brand

Learn how we helped this pet product brand migrate to Klaviyo, 3x their email revenue, and capture over 1000+ new leads in just 90 days.

Read Case Study
Learn how we helped this pet product brand migrate to Klaviyo, 3x their email revenue, and capture over 1000+ new leads in just 90 days.

Women's Health and Wellness

Pregnancy & Women’s Wellness Brand

Explore how we rebuilt this women’s health brand’s email system from the ground up—fixing broken flows and boosting subscriber engagement by 3.81% in under 30 days.

Read Case Study
Explore how we rebuilt this women’s health brand’s email system from the ground up—fixing broken flows and boosting subscriber engagement by 3.81% in under 30 days.

Don't Know Where To Begin?
Talk To Our Email Experts

Proven Strategies and Email Marketing Tips,
All Yours To Learn At No Extra Cost!

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