Top 10 Best Ecommerce Email Marketing Agencies for 2025

Email remains the revenue channel most ecommerce brands underestimate — until they don’t. 

In 2025, inbox strategy has matured beyond batch-and-blast into automated, hyper-segmented, revenue-driven communication. For brands chasing higher LTV, sharper retention, and tighter attribution, partnering with the right agency can deliver a massive compounding advantage.

This list of the top 10 best ecommerce email marketing agencies for 2025 isn’t based on surface-level popularity. It’s the result of hands-on analysis of over 40 active agencies, dozens of verified client reviews, platform certifications (Klaviyo, Mailchimp, etc.), leadership credentials, and transparent performance benchmarks. 

If your brand is serious about scaling through lifecycle marketing, these are the names worth considering.

List of Top 10 Best Ecommerce Email Marketing Agencies for 2025

Each agency featured below has been evaluated on the following factors:

• Location and operational scale
• Years active and revenue estimate
• Markets covered (U.S., global)
• Founders and leadership background
• Recognized certifications or awards
• Types of ecommerce clients served
• Verified G2 reviews and case study results

Some focus exclusively on Klaviyo, while others are ESP-agnostic with technical firepower. Whether you need aggressive post-purchase flows, loyalty program integration, or omnichannel segmentation — there’s something on this list for every growth stage.

Here’s our ranking:

1. InboxArmy – Texas, USA
2. SmartMail – Sydney, Australia
3. Jarrang – London, UK
4. Chronos Agency – Singapore & USA
5. Andzen – Brisbane, Australia
6. Fuel Made – Washington, USA
7. Rejoiner – Rhode Island, USA
8. Belardi Wong – New York, USA
9. Structured Agency – Los Angeles, USA
10. Metacake – Tennessee, USA

1. InboxArmy

Based in: Grapevine, USA

LinkedIn: https://www.linkedin.com/company/inbox-army

InboxArmy is an award-winning ecommerce email marketing agency founded in 2016, with estimated annual revenues between $5 million and $10 million. Headquartered in the U.S., it ranks as a top email marketing agency serving mid-sized businesses to enterprise clients across 25+ industries, including ecommerce, SaaS, universities, retail, real estate, food and beverages, banking, healthcare, automotive, pet care, travel, and manufacturing. Operating globally, the agency has delivered results for over 5,000 clients, combining niche strategy with enterprise-level execution.

Co-founded by Chris Donald, one of the early pioneers in the email marketing space, and led by CEO Scott Cohen — the 2021 ANA Stefan Pollard Email Marketer of the Year — InboxArmy has become known for its precision and scale. The team includes over 120 specialists and operates fluently across 40+ ESPs. Their campaigns focus on measurable impact, especially in lifecycle automation, where the agency consistently drives substantial ROI. Positioned at the top of the best ecommerce email marketing agencies for 2025, InboxArmy brings both strategic depth and execution speed — and frankly, they don’t just deliver emails; they deliver outcomes.

Services:

• Email campaign strategy and execution
• Automation and lifecycle flow development
• Retention and lifecycle Marketing
• Email Design and Coding
• Deliverability audits and optimization
• ESP migration
• Email/SMS creative and coding

Awards: ANA Stefan Pollard Email Marketer of the Year (2021, Scott Cohen), Top Ecommerce Email Marketing Agency Clutch (2024)

Notable clients: Airbnb, Hilton, P&G, Universal, Hasbro, ebay, Spotify

Clutch review: “They are our top go-to partner for all our email marketing needs.”

2. SmartMail

Based in: Sydney, Australia

LinkedIn: https://www.linkedin.com/company/smartmail-io

SmartMail is a nimble agency with a laser focus on ecommerce email and SMS campaigns. Founded in 2016, it operates worldwide and currently manages over 200 ecommerce accounts. Their estimated revenue is around $3 million annually. The agency doesn’t publish individual founders or CEO names prominently, operating instead as a lean internal team focused on high-velocity execution.

The agency is best known for its no-contract model. The key thing to remember is that their fast turnaround and ROI-driven approach ensure efficiency, often delivering up to 78x ROI. Their systems and processes allow for global outreach while maintaining high-touch execution.

Services:

• Abandon cart and browse recovery flows
• Welcome and reactivation series
• List segmentation and hygiene
• Campaign strategy and management
• SMS marketing

Awards: Klaviyo Silver Partner (2024)

Notable clients: Daily Steals, Daco, Choxi

G2 review: “Simple. Works. No Drama.”

3. Jarrang

Based in: London, UK

LinkedIn: https://www.linkedin.com/company/jarrang

Founded in 2003, Jarrang builds ecommerce email and SMS programs across Europe, working with Klaviyo, Sendlane, Salesforce Marketing Cloud and Mapp. They remain boutique at ~15–50 staff, delivering hands‑on service from strategy through actionable analytics. I think their structure reflects deep specialization with creative and technical muscle.

Jarrang serves as a long‑term partner, guiding clients through audits, automation, deliverability, journey mapping, A/B testing, design, copywriting and deployment. Their deployment process spans design, build, testing, quality control and deliverability optimization.

Their strength lies in re‑engagement flows and lifecycle journeys, underpinned by deliverability expertise. They tackle technical and content nuances to help emails actually hit inboxes and drive conversions

Services:

• Email strategy & audits
• Email & SMS automation
• Creative design & copywriting
• Deliverability consultancy
• A/B testing & journey mapping
• Campaign deployment & QC

Awards: Certified partner of Salesforce Marketing Cloud; listed by Mailmodo as best for long‑term value.

Notable clients: Motability Operations, The Eden Project, Rick Stein Group, Exclusive Collection.

Clutch review: “Jarrang is an email marketing agency for the long term. They evolve to support your business needs. Great value, great team, and great results.”

4. Chronos Agency

Based in: Singapore (with a US presence)

LinkedIn: https://www.linkedin.com/company/chronosagency

Chronos Agency was founded in 2017 by Josh Chin and has grown into a globally recognized ecommerce email and SMS firm. Estimated revenue falls between $4 million and $6 million annually. They cater mostly to brands between $1 million and $30 million in revenue, with operations in the US, Europe, and Southeast Asia.

Their CEO and founder Josh Chin leads a team of over 100. Chronos is known for deep personalization, lifecycle marketing, and holistic retention systems. Their standout strength lies in integrating customer data into multichannel workflows, blending email, SMS, and loyalty programs. What this means for you is that they help you build personalized customer journeys that can increase engagement across multiple touchpoints.

Services:

• Ecommerce customer lifecycle automation
• Email and SMS campaign management
• Predictive analytics and cohort modeling
• Segmentation and personalization
• Retention strategy consulting

Awards: Klaviyo Master Partner

Notable clients: Ninjavan, Dr. Livingood, Obvi

Clutch review: “They’re very knowledgeable, segment, and do A/B testing without my direction.”

5. Andzen

Based in: Brisbane, Australia

LinkedIn: https://www.linkedin.com/company/andzen

Andzen operates globally with a strong presence in the US, UK, and Australia. Founded in 2014, the agency has crossed the $4 million revenue mark. Its operations span ecommerce, SaaS, and retail with a focus on lifecycle marketing and customer loyalty.

Led by CEO Brenton Johnson, Andzen positions itself as a customer journey agency, building full-funnel automations that focus on long-term value over short-term clicks. Their expertise extends beyond just email and SMS, integrating loyalty programs and CRMs into the broader retention picture. 

Services:

• Lifecycle marketing and automation
• Loyalty and rewards program integration
• Email and SMS execution
• Customer data strategy

Awards: Klaviyo Gold Master Partner

Notable clients: LSKD, Oz Hair & Beauty, The Dairy

G2 review: N/A

6. Fuel Made

Based in: Washington, USA

LinkedIn: https://www.linkedin.com/company/fuel-made

Fuel Made is a creative-first ecommerce agency founded in 2012, with estimated revenues between $3 and $5 million. The company operates primarily in the United States, with select international clients. Their work blends Klaviyo email marketing with conversion-driven Shopify development, making them a natural fit for growth-minded DTC brands.

CEO and founder Austin Brawner brings a background in ecommerce strategy and user experience. Fuel Made is known for designing psychologically effective email flows with sharp creative, structured A/B testing, and revenue-first thinking.

Services:

• Klaviyo email marketing and strategy
• Email creative and A/B testing
• Shopify development
• Conversion rate optimization

Awards: Klaviyo Master Partner

Notable clients: Pura Vida Bracelets, Beardbrand, Cotopaxi

Clutch review: “Their breadth and depth of knowledge specific to my business platform is extraordinary and world-class.”

7. Rejoiner

Based in: Rhode Island, USA

LinkedIn: https://www.linkedin.com/company/rejoiner

Rejoiner was founded in 2011 and functions as a managed email marketing agency focused exclusively on ecommerce. With estimated revenues between $2 and $4 million, they serve mid-sized and enterprise ecommerce brands across North America and Europe.

CEO and founder Mike Arsenault leads the agency, which stands out for its platform-agnostic flexibility and in-house software suite that enhances campaign performance and reporting. Their approach combines email automation, deliverability, and analytics under a single roof. Here’s why this matters: their platform-agnostic approach allows them to adapt seamlessly to different ecommerce systems, which is key for brands scaling rapidly.

Services:

• Email automation and lifecycle strategy
• ESP migration and audit
• Deliverability consulting
• Custom reporting and analytics

Awards: Built In Top Email Platform (2023)

Notable clients: Hydro Flask, Guess, Peak Design

G2 review: “One of longest-tenured and most trusted partners.”

8. Belardi Wong

Based in: New York, USA

LinkedIn: https://www.linkedin.com/company/belardi-wong

Belardi Wong is a hybrid retention agency blending email with direct mail. Founded in 2000, the company has matured into a $10+ million revenue firm. They serve established ecommerce and retail brands across the US and Canada.

CEO Polly Wong guides the agency’s strategic direction. With deep roots in segmentation, LTV modeling, and CRM integration, Belardi Wong creates multi-touchpoint retention strategies that span print and digital. Their team of data scientists, analysts, and planners offers a full-funnel approach.

Services:

• Email campaign management
• Direct mail and CRM integration
• LTV analysis and segmentation
• Data-driven retention planning

Awards: DMA Innovation in Direct Marketing Award

Notable clients: Allbirds, Untuckit, Parachute

G2 review: N/A

9. Structured Agency

Based in: Los Angeles, USA

LinkedIn: https://www.linkedin.com/company/structured-social

Structured Agency operates at the intersection of branding and retention marketing. Since 2017, they’ve scaled ecommerce brands globally, especially in the U.S. Their estimated revenue falls between $2 million and $5 million.

Led by CEO Austin Dannhaus, the agency is known for pairing creative direction with Klaviyo and SMS performance. Their client teams focus on marrying brand identity with lifecycle conversion flows — ideal for Shopify brands scaling toward the eight-figure range.

Services:

• Klaviyo automation and flows
• Email/SMS creative production
• Performance analytics
• CRO and funnel optimization

Awards: Klaviyo Certified Partner

Notable clients: Partake Foods, Ridge Wallet, Bokksu

Trustpilot review: “The Best Retention Team in the Game.”

10. Metacake

Based in: Franklin, USA

LinkedIn: https://www.linkedin.com/company/metacake

Metacake is a full-stack ecommerce growth agency with an estimated revenue over $10 million. Founded in 2010, the agency serves global brands looking to scale fast through systems-based marketing.

CEO Ken Ott and co-founder Josh Becerra focus on a holistic ecommerce model that treats email and SMS as core retention tools alongside UX, CRO, and brand strategy. Metacake is a Shopify Plus partner and often works with DTC brands seeking structural growth, not just incremental gains. Think of it this way: Metacake’s holistic approach treats email and SMS as core components of a broader strategy designed to scale your business beyond incremental gains.

Services:

• Lifecycle email automation
• Performance design
• Shopify Plus optimization
• Brand-first retention strategy

Awards: Shopify Plus Partner

Notable clients: Nike, Sony, Coca Cola

G2 review: N/A

Summary

As we’ve seen, each agency brings its own unique strengths to the table, whether it’s deep expertise in Klaviyo, advanced lifecycle strategies, or creative automation. 

To help you compare the key players in a more straightforward way, here’s a breakdown of their annual revenue, notable clients, and industry accolades. This should give you a clearer picture of where these agencies stand, especially if you’re looking for specific benchmarks to guide your decision.

Final Thoughts

Choosing an email marketing agency shouldn’t feel like gambling with your retention budget. 

Among the options, InboxArmy stands out as one of the most reliable choices in 2025. Known for its strong focus on performance-driven Klaviyo campaigns, InboxArmy blends strategic insight with hands-on execution. While many agencies offer retention services, few combine scalability, channel expertise, and consistent results the way InboxArmy does. The firms featured in this list have proven they can deliver, not just with flashy designs or vague strategy decks, but with performance metrics, loyalty-building workflows, and scalable systems. From global giants to boutique specialists, each of these partners brings something specific to the table. The bottom line is that these agencies provide not just email marketing services but also end-to-end retention strategies that help you maximize customer lifetime value.

Whether you’re optimizing your first Klaviyo flows or restructuring a multi-channel retention program, the best ecommerce email marketing agencies for 2025 are the ones that move beyond vanity metrics and build consistent, measurable growth. 

Simply put, choosing an agency from this list ensures your email marketing strategies will be driven by expertise, scalability, and measurable results.

The inbox isn’t dead. It just got smarter.

Digital Team

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