Best Email Marketing Agencies in United States

Rejoiner gives you all the email marketing software, tools, and hands-on consulting you need to turn email into your top source of revenue. Direct to consumer brands like Native, Hydroflask, Guthy Renker, and Titleist have generated over $225m in last-click revenue using the Rejoiner platform while relying on Rejoiner's email marketing experts for: Strategy Design Development QA Testing & optimization Day to day campaign execution

Here's the hard truth: acquiring new customers is getting more expensive every day. But what if your growth strategy didn't depend on constantly finding new buyers? Stimulate helps eCommerce brands build sustainable growth through strategic customer retention by transforming your existing customers into your most valuable asset. Our proven retention marketing systems help high-growth brands like yours reduce churn, increase purchase frequency, and maximize customer lifetime value—so you can scale profitably without burning cash on rising CAC. Why Stimulate? 96% Channel Growth in 90 Days: Fast, measurable results that set the foundation for sustainable success. $73M+ Attributable Revenue: Proven impact across our client portfolio. 2.7+ Years Client Retention: Because we don’t just deliver; we build partnerships that last. Our Proven Approach Lifecycle Strategies for Lifelong CustomersWe go beyond retention basics, creating tailored strategies that lower acquisition costs and maximize lifetime value. Data-Driven Creative That ConvertsBold designs and personalized messaging that break through the noise and inspire action. Battle-Tested Frameworks for Predictable GrowthAchieve quick wins and long-term success with proven systems that drive ROI. Services Designed to Grow Your Brand Email Marketing: High-impact campaigns that fuse personalization with bold creative, delivering unmatched ROI. SMS Marketing: Smart segmentation and dynamic messaging that engage customers right where they are. Advanced Retention Services: From direct mail to subscriptions and upsells, we provide an integrated approach to amplify results. At Stimulate, we don’t just drive retention—we help you unlock a competitive advantage. Book your free audit today and discover how our data-driven strategies can fuel your brand’s growth and profitability.Read more

HiFlyer Digital is a human-first email and SMS marketing agency built to help ecommerce brands scale like 10-figure brands. Founded by former VP of Retention Isaac Hyman, HiFlyer Digital gives growing brands access to the same proven retention systems, psychology, and playbooks used by the top 1% of ecommerce, fully done-for-you. Instead of blasting more messages, we build better customer relationships using advanced email and SMS campaigns flow and lifecycle systems that connect with the person behind the inbox, turn one-time buyers into lifetime buyers, eliminate churn, and generate predictable revenue on autopilot, so brands can focus on growth while we handle everything else. Why We're Different Built by a former VP of Retention, not career marketers Proven systems used inside billion-dollar ecommerce brands Fully done-for-you strategy through execution Human-first approach that prioritizes connection over volume Focused on relationships, not just sends Designed to scale with your business What We Do: Build done-for-you email & SMS revenue systems for ecommerce brands Turn one-time and sometime buyers into lifetime customers Transform email & SMS into a predictable, scalable profit channel Eliminate churn and plug hidden revenue leaks Replace random campaigns with structured lifecycle systems Help brands scale like 10-figure ecommerce companies without bloated teams  How We Do It Architect full-funnel email & SMS systems using 10-figure playbooks Build advanced lifecycle flows beyond basic Klaviyo setups Handle campaigns end-to-end: strategy, copy, design, send, optimize Write human-first copy & design creatives that convert and build trust Reduce churn, increase LTV, and drive repeat purchases on autopilot Optimize continuously so email & SMS compound revenue over time ---- The Outcome for Your Brand: Predictable email & SMS revenue Higher customer lifetime value Lower churn and list burnout Systems that work 24/7 on autopilot More time for you to focus on growth --- Book a free audit now!Read more

InboxArmy is an elite, Full-service Email Marketing Agency offering the full spectrum of email marketing services, including: Full-Service Campaign Management Email Template Production Email Marketing Strategy Email Marketing Audits Email Automation & Custom Integrations We work with brands of all sizes, agencies, and email service providers to deliver best-in-class quality service, production, and support.   Why InboxArmy? Founded by one of the pioneers in email marketing since 1995 Knowledgeable team with deep roots in the email industry Proven track record of serving 5000+ clients globally Established and well-documented processes 25+ industries and verticals served No hidden fees or long-term contracts Fanatical customer service 100% ESP-agonistic    Read more

Based in Oakland, Scalero specializes in email marketing campaigns that drive measurable results for their clients. With 18 five-star reviews, this 11-50 person team demonstrates consistent expertise in the channel.