Email marketing remains one of the most powerful tools for driving customer engagement, increasing conversions, and building long-term brand loyalty. Whether you’re a growing business or a global brand, partnering with the right email marketing agency can streamline your campaigns, boost ROI, and take your strategy to the next level.
To help you find the best fit, we’ve compiled a list of the 13 best email marketing agencies in 2025. Each agency on this list brings a unique approach backed by proven results, strategic execution, and measurable success.
The frank Agency tops this list for a reason. We don’t just provide expert email marketing services, we also power campaigns with our in-house platform, BlueDotEmail, used by our team and other businesses to deliver measurable results at scale.
At The frank Agency, we specialize in crafting data-driven email marketing campaigns that do more than just land in inboxes—, they generate real results. Our certified marketing experts design personalized workflows that nurture leads, increase conversions, and build long-term customer value.
We take the guesswork out of email marketing. From audience segmentation and content development to automation and A/B testing, every campaign is built on strategic insights and performance data.
Office Location: Leawood, KS
Year Founded: 1981View all case studies
Flowium specializes in email marketing for eCommerce brands, offering tailored solutions that deliver measurable results. Their team combines industry expertise with cutting-edge tools to help businesses optimize their customer journeys, from first-time engagement to repeat purchases.
What sets Flowium apart is its focus on creating personalized, automated email workflows that build long-term customer relationships. Their deep understanding of platforms like Klaviyo ensures seamless integrations and powerful campaign performance for online retailers.
Office Location: Staten Island, New York Year Founded: 2017View all case studies
InboxArmy is a full-stack email marketing agency offering scalable solutions for businesses of all sizes—from startups to Fortune 500 brands. With a strong focus on strategy, deployment, and management, they help clients run smarter, more efficient campaigns that drive ROI.
Their team supports over 40 ESPs and offers everything from campaign production and automation to full program management. Whether you’re looking to outsource your email marketing or need support for high-volume deployment, InboxArmy delivers with precision and speed.
Office Location: Grapevine, TX Year Founded: 2016View all case studies
One 10 Media is a performance-driven agency helping DTC brands grow through data-backed email and SMS marketing. Specializing in platforms like Klaviyo, they develop lifecycle campaigns that engage customers, increase retention, and maximize customer lifetime value.
From welcome sequences to re-engagement flows, their strategies are tailored to support every stage of the buyer journey. With a strong emphasis on ROI, One 10 Media partners closely with e–commerce brands to create campaigns that generate real, measurable results.
Office Location: Medina, OH Year Founded: 2018View all case studies
InboxStars helps eCommerce brands turn email into a top-performing sales channel through personalized strategy, high-converting content, and advanced automation. Their team focuses on building scalable systems that consistently drive results—without overwhelming your internal team.
With a strong grasp of buyer behavior and email performance data, InboxStars creates tailored flows and campaigns that nurture leads, increase conversions, and build lasting customer relationships.
Office Location: Boston, MA Year Founded: 2021View all case studies
DOE Media helps direct-to-consumer brands unlock consistent growth through high-converting email and SMS campaigns. Their team blends creative, strategy, and data to craft automated flows and broadcast campaigns that move customers through the buying journey.
They focus on full-service retention marketing, —from copy and design to automation and analytics, —ensuring every message is tailored to drive engagement, loyalty, and long-term revenue.
Office Location: Chicago, IL Year Founded: 2018View all case studies
Sweatpants Agency delivers hands-on email and SMS marketing built for eCommerce growth. With a lean, expert team and a Klaviyo Gold Partner badge, they create custom flows, campaigns, and retention strategies designed to boost customer lifetime value.
Their approach combines creative, strategy, and automation—without bloated processes. Sweatpants works closely with founders, operators, and marketing teams to build campaigns that convert while keeping things simple and efficient.
Office Location: Owings Mills, Maryland Year Founded: 2018View all case studies
Smartmail specializes in fully managed email marketing for growing eCommerce stores. Their team handles every aspect of your email program, —from strategy and creative to automation and list management, —so you can focus on running your business while they drive conversions.
Using customer behavior data and performance insights, Smartmail builds lifecycle campaigns that target the right shoppers at the right time. Their approach is hands-off for clients but hands-on in execution, making them a strong partner for brands looking to scale retention marketing without building an internal team.
Office Location: Grand Prairie, TX Year Founded: 2013View all case studies
Moburst is a global digital agency offering email marketing as a key part of its larger performance and growth marketing services. Known for working with both startups and enterprise brands, they create email strategies that align with user behavior, brand goals, and long-term customer engagement.
Their email team focuses on segmentation, automation, and personalized content that drives conversions, —while integrating seamlessly with paid media, product strategy, and mobile optimization for a complete growth ecosystem.
Office Location: New York City, NY Year Founded: 2015View all case studies
MH Digital is an email marketing agency built for brands that want to turn retention into a revenue driver. With a strong focus on lifecycle strategy, they create automated flows, campaigns, and SMS programs that deepen customer relationships and boost long-term value.
Their team takes a collaborative, data-informed approach—combining creative, segmentation, and platform expertise to drive results across every stage of the customer journey.
Office Location: Denver, CO Year Founded: 2017View all case studies
Coalition Technologies offers comprehensive digital marketing solutions, including SEO, PPC, and email marketing designed to grow your brand’s online presence and revenue. Their email marketing team creates targeted campaigns and automated workflows that engage audiences and nurture leads.
With a focus on data-driven strategies, Coalition integrates email marketing with broader digital efforts to maximize ROI and improve customer retention.
Office Location: Los Angeles, CA Year Founded: 2009View all case studies
Markethix specializes in crafting targeted email campaigns that deliver measurable results. Their team focuses on blending creative messaging with precise audience segmentation to maximize engagement and conversions.
With expertise in marketing automation and analytics, Markethix helps brands build scalable email programs that nurture leads, increase retention, and boost overall revenue.
Office Location: Winter Park, FL Year Founded: 2011View all case studies
Thrive Internet Marketing Agency is a full-service digital marketing firm that offers a wide range of services, including email marketing, SEO, PPC, web design, and social media management. Their email marketing strategies are tailored to enhance client engagement, nurture leads, and boost conversions.
By leveraging advanced tools and industry best practices, Thrive ensures that each email campaign is optimized for performance and aligned with clients’ business objectives.
Office Location: Arlington, TX (Headquarters), with teams across 34 states and 10 countries Year Founded: 2005View all case studies
Choosing the right email marketing agency can significantly impact your campaign success, helping you reach the right audience, increase engagement, and drive conversions. The agencies featured here bring proven strategies, innovative tools, and tailored approaches to ensure your email marketing efforts deliver measurable, sustainable results in 2025 and beyond.
An agency brings expertise, proven strategies, and tools to craft targeted campaigns that improve engagement and boost ROI.
Clear messaging, personalized content, strong calls to action, and proper segmentation are key to success.
Automation saves time, nurtures leads consistently, and delivers the right message at the right moment to increase conversions.
Yes, agencies provide detailed tracking and reporting to measure performance and optimize future campaigns.
BlueDotEmail is The frank Aagency’s proprietary tool that generates optimized campaign names to increase open rates and engagement.
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