Email marketing is one of the most powerful marketing tools in 2025, where approximately $1 spent produces £28 of ROI.
However, as businesses seek to maximise the potential of email marketing, the choice is now between using email marketing tools directly or partnering with a specialised agency.
Tools might seem like a cheap and easy option, but would these tools—lacking human emotion, failing to understand the psychology of your target audience, and being unaware of market trends—be effective in capturing readers’ attention within seconds?
The answer is a resounding no, as tools are not designed to connect with or persuade humans to take action, no matter how hard they try.
If you are convinced to give email marketing a try, we have compiled a list of the best email marketing agencies available on the market.
Top ten email marketing agencies
The following is a list of the best email marketing agencies you can trust.
1. Delivix Digital
Headquarters: Glasgow, Scotland
Founded: 2023
Specialties:
Delivix Digital is recognised as one of the top email marketing agencies, thanks to its cutting-edge technology and personalised services tailored to each client.
As a comprehensive email marketing agency, Delivix provides customised email marketing services tailored to each client’s targeted revenue and audience, helping them expand their product reach to a broader audience while strengthening customer relationships.
The following are the unique features of Delivix Digital.
- Integrated SEO and content strategy along with email marketing.
- Personalisation of each email according to customers’ pain points
- Data-driven campaign optimisation that aligns with market trends and provides detailed performance analysis
- Automated workflows for the entire customer lifecycle to save time and avoid extra charges
What Sets Them Apart:
Delivix Digital’s strength lies in ensuring that email campaigns are seamlessly integrated with your business’s broader marketing strategies.
Our team of professionals creates highly personalised email experiences by understanding customer needs, which eventually increases engagement and conversions.
Notable Services:
- Strategic development of email campaign execution
- Advanced email marketing automation management set-ups
- Customer-oriented email template design
- List building and segmentation strategies
- A comprehensive performance tracking system and reporting process monitors the results.
2. InboxArmy LLC
Headquarters: Grapevine, Texas
Founded: 2016
Employees: 120+
Specialties: Email marketing services, campaign management, automation strategy
InboxArmy is a well-established email marketing agency with over 5,000 brands as its customers, having worked across more than 25 industries.
Their team of top-notch professionals specialises in building, backtesting, and managing all of your email campaigns to maximise the results.
They provide the following services.
- Proven track record across multiple industries
- Create data-driven optimisation strategies to improve reach
- Customisation of SMS campaigns alongside email marketing campaigns.
Notable Clients: Maven Lane, RCJuice, Zinch, Boie
3. Flowium
Headquarters: New York
Founded: 2017
Employees: 51–200
Specialties: eCommerce, email marketing, SMS marketing, customer retention
Flowium specialises in eCommerce email marketing and also has a partnership with Klaviyo to produce effective campaign optimisation services.
It is best suited for online retailers who need to quickly turn first-time buyers into loyal customers without incurring significant expense.
What makes it stand out from others is
- Specialized in producing comprehensive email campaigns for eCommerce brands
- Provide free audits of email marketing.
- Multi-platform integration capabilities
Notable approach: Flowium uses a combination of data-centric methodology and creativity to scale sustainably.
4. Action Rocket
Headquarters: London, United Kingdom
Founded: 2011
Team Size: 12 specialists
Action Rocket is best known for creating award-winning designs and developing emails that stand out in crowded inboxes.
One of the most common issues businesses face is declining email engagement. Action Rocket produces innovative visual storytelling and interactive email experiences to address this challenge.
This creative approach ensures that brands can stand out in the digital noise to capture subscriber or reader attention effectively.
Notable Clients: BBC, UNICEF, Nescafé Dolce Gusto, Marks & Spencer, The Body Shop.
5. SmartMail
Headquarters: New York, United States
Founded: 2010s
If you are a business owner struggling to make an impact online, don’t worry—SmartMail is the ideal solution for you.
This agency employs data-driven email strategies, which have generated over £146 million in revenue for its clients.
They primarily focus on managing the eCommerce customer journey with the help of automated sequences that enhance the user experience and encourage repeat business.
Notable results: SmartMail has added more than 163 million new subscribers to its clients, which collectively generated £146 million in email revenue by sending just 11 billion emails.
6. The Email Marketers
Headquarters: Los Angeles, CA
Founded: Recent establishment
They implement fully optimised marketing campaigns, along with SMS strategies, to solve conversion optimisation challenges for their clients.
What sets it apart is their growth marketing approach, which includes an incremental growth model and a heavy emphasis on data attribution.
Notable Results:
The email marketer has achieved a revenue increase of over 835% in under 60 days for Llama Naturals.
7. Sweat Pants Agency
Headquarters: United States
Founded: Recent establishment
Sweatpants is best known for its partnership with startups and converting them to large-scale businesses.
For your email marketing, Sweat Pants solves the critical problem of growth plateau by utilising data-driven lifecycle marketing that focuses on retention and acquisition optimisation.
Notable Clients: SnapNurse, Amazon, Hunt A Killer, BombTech Golf, SugarWish.
8. Disruptive Advertising
Headquarters: Pleasant Grove, Utah
Founded: 2012
Team Size: 150+ employees
Disruptive Advertising enables an effective email marketing campaign by integrating social advertising, paid search, and a focus on customer acquisition and remarketing.
They developed cohesive strategies to integrate email marketing within broader digital marketing ecosystems, addressing the issue of siloed marketing efforts.
Notable Results:
The trust of their clients led them to manage more than £350 M in annual ad spend.
9. Email Uplers
Headquarters: Ahmedabad, India (with global operations)
Founded: 2013
Team Size: 500-999 employees
With more than 5,000 customer brands across 52 countries, Email Uplers has provided cost-effective and high-quality email design and coding services since 2013.
What sets them apart from others is the ability to deal with resource limitations, email marketing teams, and offer not only specialised design but also development services at scale.
Notable clients include Facebook, Amazon, Disney, and National Geographic.
10. Chronos Agency
Headquarters: Singapore and Sydney, Australia
Team Size: 90+ digital marketing experts
A team of specialised experts leads Chronos Agency in creating high-quality email and SMS marketing campaigns, push notification marketing, and behavioural targeting to enhance customer retention and loyalty.
Moreover, their multi-channel lifestyle communication strategy helps businesses with the challenges of customer lifecycle optimisation, especially for rapidly scaling DTC brands in this ever-evolving competitive market.
Top 10 email marketing agencies – comparison table
| # | Agency Name | Headquarters | Founded | Specialties / Focus Areas | What Sets Them Apart |
|---|---|---|---|---|---|
| 1 | Delivix Digital | Glasgow, Scotland | 2023 | Email Marketing, SEO, Web Development, UX/UI Design | Integrates SEO and content strategy with personalized email marketing. |
| 2 | InboxArmy LLC | Grapevine, Texas | 2016 | Email Campaign Management, Automation, SMS Integration | Proven multi-industry results via customized cross-channel campaigns. |
| 3 | Flowium | New York, USA | 2017 | eCommerce Email & SMS Marketing, Retention | Offers free audits; specializes in data-centric eCommerce growth. |
| 4 | Action Rocket | London, UK | 2011 | Creative Email Design & Development | Focuses on award-winning interactive email experiences. |
| 5 | SmartMail | New York, USA | 2010s | eCommerce Automation, Email Strategy | Generated $187M+ in revenue and 163M+ new subscribers for clients. |
| 6 | The Email Marketers | Los Angeles, CA | Recent | Email & SMS Marketing, Conversion Optimization | Data-based model; achieved an 835% revenue increase for a single client. |
| 7 | Sweat Pants Agency | USA | Recent | Lifecycle & Retention Marketing | Helps startups scale through a retention and data-driven approach. |
| 8 | Disruptive Advertising | Pleasant Grove, Utah | 2012 | Email, Paid Search, Social Media, Remarketing | Manages over $450M in annual ad spend across multiple channels. |
| 9 | Email Uplers | Ahmedabad, India | 2013 | Email Design, Coding, Development Services | Large-scale resource hub helping brands overcome team limits. |
| 10 | Chronos Agency | Singapore / Sydney | Recent | Email, SMS, Push, Behavioral Targeting | Specializes in lifecycle communication for scaling DTC brands. |
How to evaluate email marketing agencies?
Selecting the right email marketing agency is the first step to the success of marketing campaigns. The following are the most critical factors to consider before trusting any agency.
Track record and trustworthiness (20% weight)
First and foremost, check the track record and industry reputation. After all, you don’t want to waste your time and money with someone who isn’t experienced in their field. Look for reviews, client testimonials, case studies, and industry awards to determine if the agency is delivering results.
Moreover, choose agencies with experience in your own specific industry.
Tools, technology, and resources
To stay ahead of your competition in 2025, you must have access to the necessary advanced email marketing tools, automation programs, and resources.
So, before selecting an email marketing agency, determine if they have adequate resources and certified expertise in the relevant email service provider.
Communication and reporting standards
Communication is key to success, so determine the agency’s communication processes, frequency of reporting system, and the level of transparency in sharing performance data.
Pricing structure and value proposition
Pricing is the most critical factor, especially for startups. Always consider and compare pricing models, contract terms and conditions, and the overall value proposition of all email marketing agencies.
Frequently asked questions
The most common questions we get asked.
- Open rates below 20% and click-through rates below 2% are considered alarming.
- If high unsubscribe rates are more than 2%
Not only this, but deliverability optimisation is also a task of agencies that maintain a strong sender reputation and high inbox placement rates. However, all of this requires proper list management, authenticated set-up, and, most importantly, effective content optimisation strategies.
