Best Email Marketing Companies of 2025

Email marketing can feel like an uphill battle, but when done right, it’s a game-changer.

Email marketing in retail and e-commerce can yield an ROI of $45 for every dollar spent, but the right strategies are key. However, not many businesses understand email marketing fundamentals.

That’s not all. 

A recent Content Marketing Institute shows that almost 60 percent of marketers find crafting effective content that drives action challenging. 

With email users set to grow to almost five billion by 2027, if you can reach (and stay) in people’s inboxes, you can make a ton of money, but getting there isn’t easy.

That’s where an email marketing agency comes in, and I’ve created a list of the top six agencies. These companies create a plan and collect and manage email addresses. They’ll also build email marketing campaigns to fuel business growth. 

Table of Contents

• The 6 Top Email Marketing Companies in The World
• Key Takeaways
• NP Digital – Best For Full-Service Email Marketing
• InboxArmy – Best For Startup Email Marketing
• Action Rocket – Best For Custom HTML & CSS enterprise email
• SmartMail – Best For E-commerce Email Marketing
• Moburst – Best For Mobile Email Marketing
• MH Digital – Best For Technical/Creative
• Characteristics of A Great Email Marketing Agency
  • 1. Well-versed in content creation
  • 2. An Impressive Portfolio
  • 3. Thought Leadership
  • 4. Real Life Testimonials
  • 5. A Diversified Team of Experts
• How To Work With An Email Marketing Agency
  • 1. A discovery session
  • 2. Research & strategy recommendations
  • 3. A contract with project deliverables
  • 4. Client onboarding
• FAQs
• Conclusion

The 6 Top Email Marketing Companies in The World

1. NP Digital – Best for full-service email marketing
2. Inbox Army – Best for startup email marketing
3. Action Rocket – Best for custom HTML & CSS enterprise email
4. SmartMail – Best for e-commerce email marketing
5. Moburst – Best for mobile email marketing
6. MH Digital – Best for technical/creative

I’m confident the best email marketing companies listed above and reviewed below are reliable because of their proven track records. Hire any of them according to your needs, and they’ll help you turn email marketing into a growth channel for your business.

Without further ado, let’s explore each of these companies and see for yourself why we consider them the very best. 

Key Takeaways

• Nearly sixty percent of companies say crafting content that gets results is challenging.
• Email marketing delivers up to $45 ROI per $1 spent—but only with the right strategy.
• Email marketing agencies enhance your marketing by copywriting, designing, and segmenting emails for success. They can also assist with the technical side, like ensuring your emails are mobile-optimized.
• Characteristics to look for in an email marketing agency are niche expertise, a proven track record, and the right team of experts.
• Knowing your goals before going to an agency is essential; this helps you better assess how they can help.

NP Digital – Best For Full-Service Email Marketing

Email marketing works—but only when your content resonates.

According to a report by GetResponse, the average email open rate is 39.64 percent, and the average unsubscribe rate is 0.15 percent. Now, guess what was one of the top three reasons people unsubscribe from emails? Bad content!

In other words, irrespective of how excellent your email marketing strategy is, writing killer emails that resonate with your prospects and keep you in their inbox requires excellent content. 

This is one area where we stand out from the crowd. 

At NP Digital, we deliver full-service marketing support through multi-channel email campaigns, seamlessly supporting every aspect of your email marketing strategy.

But there’s more to us than email marketing. We offer a host of solutions for a holistic approach to growing your business online, including:

• A/B testing
• Paid and earned media
• Data and analytics
• Creative strategy
• Website design

One of the key reasons that we emphasize these additional services is because for NP Digital, email marketing doesn’t work in a vacuum. We focus on finding omnichannel marketing opportunities for email clients to make sure that their email efforts are reinforced in other parts of the marketing funnel, leading to greater return on investment.

InboxArmy – Best For Startup Email Marketing

For in-house teams looking for rapid email marketing turnaround, InboxArmy comes highly recommended. 

As a full-service email management company, InboxArmy offers a spectrum of services, including:

• email template design
• email strategy and audit
• SMS marketing
• email campaign management
• dedicated email marketing services

This email marketing agency offers volume-based pricing for companies and white-label services to generate more sales and higher revenues. Additionally, they support 40-plus email marketing platforms, including Klaviyo, Omnisend, and MailChimp.

They serve clients from government agencies like Texas Health Resources and companies such as Zappos, Airbnb, eBay, and other leading brands. 

Action Rocket – Best For Custom HTML & CSS enterprise email

Action Rocket needs no introduction in the enterprise email marketing sector. 

This company even partners with the top email marketing software brands like MailChimp, Litmus, and Campaign Monitor to drive innovation in the email space. 

Action Rocket has years of experience strategizing and executing custom HTML and CSS email and CRM design systems for voice, VR, emerging search tech, and Metaverse. Other services are digital copy, strategy, coding, and interactive email development.

Founded in 2011, the company works with a tight-knit team of experienced developers who are excellent at strategy, design, and coding of complex and customized email programs. 

Their client roster speaks for itself, including American Express, Caffe Nero, BBC, Marks & Spencer, Global Radio, and many others.

SmartMail – Best For E-commerce Email Marketing

SmartMail is a done-for-you (DFY) email marketing agency that serves e-commerce and D2C businesses.

Across the customer lifetime cycle, SmartMail is exceptional at strategizing and executing optimized email marketing campaigns for e-commerce businesses. Services include:

• A full email marketing plan covering email strategy, automation setup, campaign management, etc.
• Email campaign management
• Email management
• List management and growth
• SMS marketing

Additionally, they have a track record and excellent results to show. 

Over 150 brands trust it, and it’s sent and tested over 11 billion emails. Clients include Lowes, Skechers, French Connection, Cotton On, and others.

Moburst – Best For Mobile Email Marketing

Moburst uses a data-first mindset to tailor effective campaigns and provides ongoing optimization for online success.

The full-service marketing, mobile-first agency helps clients scale and transforms them into category leaders.

They have worked with over 600 products and base their strategies on real-time data for the best results. 

This email marketing agency offers extensive services, including SEO, concept and design, user-generated campaigns, and UI/UX. 

Moburst creates an automated process that encourages user action, regardless of the funnel stage.

Email services available are:

• End-to-end email marketing (handling the entire email campaign)
• Advanced automation
• Building new assets or integrating them into your existing processes

Recent accolades include seven Gold awards at the 2024 MUSE Creative Awards.

Their clients include Uber, Discovery, and Calm.

MH Digital – Best For Technical/Creative

MH Digital works with many clients who rely on email and SMS for a substantial part of their revenue. It acts as a partner in your email, push, and SMS marketing to help build your business.

The agency has expertise with Braze and Klaviyo and offers extensive email marketing services, including:

• End-to-end email, push, and SMS
• Collaborating on content strategy
• Copywriting
• Responsive design
• Segmentation
• Customer journey and platform management
• List cleaning and deliverability management
• Third-party integration and setup

They set up and launch campaigns to achieve long-term conversions and retention sustainability. They start with setup, audit, and implementation. Then builds in:

• Automation and flows
• Monthly support with campaign management (copywriting, design, email development, etc.)
• Data analysis for segmentation and growth

MH Digital encourages growth by beginning with copy and design before focusing on segmentation, launch, and analysis. The agency carefully crafts content to match your tone and voice while reinforcing your brand value propositions and winning more customers.

They also assist with the technical side, such as mobile responsiveness and strategy.

Clients include Purina, Four Sigmatic, and Ritual.

Characteristics of A Great Email Marketing Agency

The agencies we’ve listed have all earned their place on this list, but you might be looking for alternatives. Perhaps you need an agency specializing in a different niche or skillset, for example

Whether you choose one of the email marketing companies from this list, or search for other options, look for these key traits.

1. Well-versed in content creation

The quality of your email content can significantly affect the effectiveness of your email marketing campaigns. 

High-quality, engaging content creation is a fundamental characteristic of a top email marketing company.

A world-class email marketing agency will help you combine top-tier content with amazing promotions to achieve the conversions you need. Great companies seamlessly blend the two.

2. An Impressive Portfolio

An email marketing company that claims to be among the best has a portfolio to back it up.

A portfolio of case studies allows you to see the process behind the agency’s email marketing campaigns and the success of its strategies.

An agency should be proud of its hard work and the results it achieved for its clients. Their portfolio helps you see who they have helped and decide if they’ll be a good fit for your company.  

3. Thought Leadership

Trends and modern strategies in email marketing are constantly evolving, so email marketing companies must keep pace with these changes to deliver the best work.

Thought leadership is how the top email marketing brands keep much-needed pace with the industry. 

How do they do this?

By publicly sharing our new insights, experiments, emerging strategies, and tactics to retain our brand reputation among other professionals. 

Look out for this characteristic, as it is an excellent way to spot the best agencies.

4. Real Life Testimonials

In the business setting, you’ll find what past and existing clients feel and say of a company’s work in the testimonials they leave behind. 

A notable characteristic of the top email marketing company is the real-life testimonials they receive from clients for their work publicly.

5. A Diversified Team of Experts

From strategy to acquiring email addresses, selection of email marketing software, email copywriting, and campaign management, they all require different kinds of expertise.

One characteristic of top email marketing companies is usually a team of experts, collaborating to drive results. Verify the team’s expertise by viewing the entire team that will work to plan, execute, manage, and optimize email campaigns: 

How To Work With An Email Marketing Agency

Exceptional email marketing companies help you transform email into a real business growth channel by:

• Nurturing prospects into customers
• Facilitating customer relationship management 
• Turning email marketing into a reliable content medium. 

But before you can enjoy these benefits, you need to go through some initial steps when starting with an agency. Some of the most notable ones include:

1. A discovery session

Excellent email marketing companies begin by offering a discovery session and follow-up communications to determine if it can solve your specific problems. 

After completing the form, get questions to ask ready for your discovery call, like:

• How do you tailor a strategy to my business goals?
• Who will be my primary contact?
• Which pricing structures do you use?

2. Research & strategy recommendations

During the discovery call, the company usually gains more clarity and context about your business needs. However, they don’t usually propose a solution right away. 

Top email marketing brands typically review your insights and perform detailed research. 

After the research, they typically email a summary of their findings and recommendations or schedule a follow-up call. 

The call usually ends with deciding whether you’re a good fit to work together.  

3. A contract with project deliverables

If everything goes well and you like their recommendations, the company will send you a contract detailing their services and pricing.

This contract will also outline project timelines and deliverables, legal requirements to work together, and your expected investment.

4. Client onboarding

If the contract, project scope, deliverables, pricing, and other details look good, it’s time to move forward. Exceptional email marketing companies use a custom onboarding process so you can start working together.

The onboarding process helps you and the company understand how to manage your product and any other necessary elements for a smooth working relationship.  

FAQs

What does an email marketing agency do?

Email marketing agencies help businesses develop and execute targeted email campaigns to engage audiences and drive results. They typically start with an audit to assess current performance, then create a tailored strategy. This includes writing and designing emails, optimizing for mobile and deliverability, managing segmentation and automation, running A/B tests, and analyzing performance to improve engagement and ROI.

How to choose an email marketing agency?

To choose the right email marketing agency, look for industry experience, client testimonials, and strong content creation skills. Ensure they stay ahead of trends, offer thought leadership, and align with your budget and communication needs.

Conclusion

Email marketing isn’t an afterthought—it’s a powerful growth channel.

Most businesses recognize the need for social media, SEO, content marketing, and others early on, but they leave emails in the backseat because it is not trending. 

Whether you DIY or partner with one of the top email marketing companies we’ve included the key is taking action now. The right agency will craft compelling emails, optimize automation, and drive real revenue growth.

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