Top 10 Best Email Marketing Agencies To Switch To In 2025

Last Updated: 

November 19, 2024

Email marketing in 2025 is more than just sending messages — it’s about creating memorable interactions with customers. With a growing focus on personalised and strategic communication, email marketing has become irreplaceable for businesses aiming to strengthen customer connections. 

Moreover, the right agency can help your business create impactful campaigns that not only engage but also drive results. Let's take a look at the leading email marketing agencies for 2025, along with tips on choosing one that best suits your needs.

Key Takeaways on Top 10 Best Marketing Agencies

  1. Email marketing evolution: In 2025, email marketing is more about creating meaningful interactions than just delivering messages, emphasising the importance of customer engagement.
  2. Top agencies offer specialised services: Leading email marketing agencies like InboxArmy and KlientBoost provide specialised services from lifecycle marketing to multi-channel strategies, tailored to boost customer retention and growth.
  3. Content variety and customisation: Each agency on the list offers unique service mixes, including email automation, SMS integration, and personalised graphics, allowing businesses to tailor their campaigns for maximum impact.
  4. Focus on customer journey: Many agencies, such as MH Digital and Enflow Digital, emphasise supporting the entire customer journey, from initial contact to loyalty-building, ensuring sustained engagement.
  5. Importance of platform expertise: Top agencies leverage popular platforms like Klaviyo and Mailchimp, making them proficient in creating optimised, platform-specific content for various client needs.
  6. Targeted pricing structures: Pricing among these agencies varies widely, from tiered and custom plans to project-based pricing, allowing businesses of all sizes to find suitable services within their budget.
  7. Strategic agency selection: When choosing an agency, it's essential to consider your business's specific needs, budget, and the agency’s experience in your industry for the best campaign outcomes.
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Top 10 Best Email Marketing Agencies 

1. InboxArmy

inbox army website email marketing agency

InboxArmy is a specialised email marketing agency that covers everything from testing to analytics. They’ve built campaigns for major brands with a focus on optimising the customer journey.

  • Location: United States  
  • Team Size: 50+  
  • Pricing: Customised based on project scope  
  • Services: Email testing, marketing acquisition, analytics, platform migration  
  • Notable Clients: eBay, Jockey, Expedia, Airbnb, Spotify  

With InboxArmy, brands get thorough QA, insightful reports, and seamless platform transitions, making it easier to scale email efforts and keep campaigns running smoothly.

2. KlientBoost

KlientBoost website email marketing agency

KlientBoost stands out for driving growth and engagement with multi-channel marketing. They combine email, SEO, and paid ads to attract customers, turning leads into loyal buyers.

  • Location: United States  
  • Team Size: 50+  
  • Pricing: Tiered based on business needs  
  • Services: Full-service email marketing, SEO for organic growth, and PPC advertising across platforms (Google, Facebook)  
  • Notable Clients: Airbnb, Care.com, SAP, Segment, Juniper  

KlientBoost helps clients boost revenue by aligning email campaigns with their larger marketing strategy. They’re known for creating clear, focused messages that enhance visibility and generate lasting customer connections.

3. Fuel Made

Fuel Made website email marketing agency

Fuel Made leverages Klaviyo to deliver email and SMS marketing for ecommerce brands, boosting sales with personalised and automated messages.

  • Location: United States  
  • Team Size: 10-49  
  • Pricing: Starting at $5,000  
  • Services: Klaviyo email and SMS automation, segmentation  
  • Notable Clients: Kai Collective, Popsmith, Kris Nations  

Fuel Made’s focus on segmentation and automation makes it easy for brands to send relevant messages, from product launches to personalised offers, that resonate with customers.

4. Enflow Digital

Enflow Digital website email marketing agency

Enflow Digital combines email with SMS to support ecommerce and SaaS brands, creating coordinated campaigns that reach customers across channels.

  • Location: Lithuania  
  • Team Size: < 20  
  • Pricing: Custom  
  • Services: Email for ecommerce, SMS integration for lifecycle marketing  
  • Notable Clients: Affirm Me, Lively Paws, LIPOSENTIALS  

Enflow Digital’s strength lies in their omnichannel approach, using email and SMS to nurture leads, build loyalty, and drive conversions.

5. MH Digital

MH Digital website email marketing agency

MH Digital offers a focused, streamlined approach to email marketing, ideal for brands wanting a small but powerful team handling their campaigns.

  • Location: United States  
  • Team Size: 2-9  
  • Pricing: Starting at $1,000  
  • Services: Lifecycle marketing, automated campaigns, newsletters  
  • Notable Clients: Kaiyo, Ritual, Lambs, Flex  

They specialise in email automation and lifecycle marketing, helping brands nurture relationships at every customer stage, from first touch to repeat purchases.

6. Kas Andz Marketing Group

Kas Andz website email marketing agency

Kas Andz offers structured email outreach, newsletters, and automation to keep customers engaged over time.

  • Location: United Kingdom  
  • Team Size: 10-49  
  • Pricing: Starting at $1,000  
  • Services: Email newsletters, automation, customer outreach  
  • Notable Clients: Pulse Pixel, BullionBox, BakeSale  

Known for methodical email workflows, Kas Andz ensures that messages reach the right people at the right time, building brand trust and familiarity.

7. Tiger Systems Ltd

Tiger Systems LTD website email marketing agency

Tiger Systems helps brands reach customers at different points of their journey, creating campaigns that generate consistent engagement.

  • Location: United Kingdom  
  • Team Size: 2-9  
  • Pricing: Starting at $1,000  
  • Services: Customer lifecycle campaigns, targeted communication strategies  
  • Notable Clients: The Mercury, Charlton Networks, NHS  

They guide brands in developing communication strategies that keep customers engaged from onboarding to loyalty, maximising each touchpoint’s value.

8. The Bre Creative

the Bre Creative website email marketing agency

The Bre Creative mixes email marketing with brand building, helping clients create impactful email campaigns that reflect their brand’s personality.

  • Location: United States  
  • Team Size: < 20  
  • Pricing: Fixed rates for branding and web design services  
  • Services: Email marketing strategy, branding, custom graphics and templates  
  • Notable Clients: Glo Party + Co., Oh My Darling Party Co., Stellar Creations  

This agency brings a visual touch to email, ensuring every campaign looks and feels unique. Their team can design brand assets, from logos to GIFs, for emails and social media.

9. SmartMail

SmartMail website email marketing agency

SmartMail is all about growing subscriber lists and creating responsive, engaging templates that look great on any device.

  • Location: United States  
  • Team Size: 19  
  • Pricing: Custom  
  • Services: Campaigns, list growth, workflows, responsive templates  
  • Notable Clients: Skype, Njoy, Kazaa  

SmartMail’s focus on building responsive templates helps brands make a strong impression, ensuring emails are accessible and appealing across devices.

10. Rejoiner

Rejoiner website email marketing agency

Rejoiner provides hands-on email marketing for B2C brands, emphasising list-building and deliverability to make campaigns as effective as possible.

  • Location: United States  
  • Team Size: 10-49  
  • Pricing: Starting at $1,000  
  • Services: List building, strategy, copywriting, deliverability management  
  • Notable Clients: B2C brands  

Rejoiner’s team helps brands build email lists and improve deliverability rates, making sure messages land in inboxes and drive engagement.

How to Choose an Agency

Navigating the selection of an email marketing agency demands a clear eye on what moves your business forward. Take a deep look at their past wins and current clients — agencies well-versed in your field grasp the nuances and sweet spots that make campaigns truly connect.

The service mix tells its own story. While some shops live and breathe email marketing, others weave in SEO, paid ads, and broader channels. Think about how this meshes with your current marketing rhythm and where you dream of going next. Moreover, money talks too — set your spend limits, but remember that excellence often commands premium rates.

Conclusion

Each of these agencies brings something unique to email marketing. So, whether you’re looking for a multi-channel solution, brand-driven visuals, or focused lifecycle campaigns, these options cover a range of needs and budgets. 

To choose the right one, think about what fits best with your goals, target audience, and resources. After all, the right email marketing agency can elevate your brand’s reach, keeping customers engaged, informed, and coming back. 

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