- Template item
When your email marketing program underperforms, the symptoms are easy to spot: low ROI, weak engagement, and a creeping sense you’re wasting budget on campaigns that don’t convert.
You can tweak copy, swap templates, or test send times, but if the fundamentals are broken, you may need to overhaul your entire email marketing strategy.
It’s at this stage that many businesses start looking for an email marketing agency. The right agency can restructure your strategy, fix your list segmentation and automation, and finally make your campaigns drive sales.
But here’s the catch: there are hundreds of agencies out there, and they all promise good results. How do you choose an email marketing firm that delivers high-quality results instead of just pretty emails?
In this guide, you’ll find:
- Seven vetted email marketing agencies worth considering
- A checklist for what to look for when hiring an email agency, and
- When it makes sense to hire an email marketing expert instead of an agency
What does an email marketing agency do?
An email marketing agency is a specialized marketing agency that helps companies design, execute, and optimize email marketing campaigns to drive measurable results such as sales, qualified leads, and customer retention.
Unlike generalist marketing agencies, an email marketing firm focuses entirely on email as a revenue channel, offering deep expertise in strategy, automation, segmentation, and creative execution.
Here’s what an email agency typically handles:
- List growth and new subscribers – Develop strategies to attract and capture new subscribers through website forms, landing pages, ecommerce pop-ups, and lead magnets.
- Segmentation – Organize your email subscribers into targeted groups based on demographics (or firmographics), behavior, purchase history, or engagement level, ensuring your email marketing campaigns are relevant and personalized.
- Email automation – Set up automated workflows like welcome sequences, abandoned cart reminders, re-engagement series, and post-purchase follow-ups to keep your audience engaged without manual effort.
- Campaign creation – Plan and create campaigns that align with your brand goals, seasonal events, and promotions, by combining compelling copywriting, effective templates, and professional design.
- Design and branding – Create on-brand, mobile-friendly templates that don’t just look good but drive conversions.
- Analytics and reporting – Track metrics, like opens, clicks, conversions, and revenue generated, to optimize future campaigns based on real data.
- Deliverability management – Monitor sender reputation, inbox placement, and compliance with email regulations so your messages reach subscribers instead of spam folders.
- Integration with other email platforms – Connect your campaigns and automations with tools like Klaviyo, HubSpot, and Mailchimp to streamline workflows.
- Testing and optimization – Run A/B (or multivariate) tests on subject lines, layouts, and calls-to-action to consistently improve performance.
How an email marketing agency differs from a generalist agency
While many generalist marketing agencies claim they “do email,” the depth of service is rarely the same as what you get with a specialized email marketing agency. Here’s how they compare:
Read: How to Structure an Effective Email Marketing Team
How to choose the right email marketing agency
As you try to vet email marketing agencies to find the best choice for you, here are some tips to help you make the right pick:
1. Define your goals.
If you can’t define what success looks like for you, the agency you choose can’t deliver it. Nail down the metrics that matter most to your business before you even start shortlisting.
- Set primary KPIs – Focus on revenue per email, lead conversion rate, and subscriber retention, not just open rates.
- Clarify your priorities – Decide whether you’re targeting acquisition, lifecycle marketing, retention, or something else entirely.
- Define your channels – Will the agency manage email marketing only, or also SMS, CRM, and other touchpoints?
- Share benchmarks upfront – Provide your average open rate, average order value (AOV), churn rate, and other baseline data so the agency can plan with accuracy.
2. Check the agency’s deliverability rates.
A beautiful email is useless if it never reaches the inbox. The right agency should be able to walk you through exactly how they protect your sender reputation and optimize inbox placement.
- Ask about list hygiene – How do they remove inactive subscribers, handle bounces, and monitor spam complaints?
- Verify authentication protocols – Ensure they use SPF, DKIM, and DMARC to boost trust with major email platforms.
- Review segmentation strategy – A good email marketing firm will segment inactive lists differently to avoid deliverability drops.
- Understand ongoing monitoring – Deliverability isn’t a one-time setup; the agency should track deliverability rates regularly and tweak the strategy when needed.
3. Demand industry-specific expertise.
Generic tactics rarely work as well as targeted ones. Look for an agency with a proven history of success in your niche.
- Ask for relevant case studies – The agency should show results for ecommerce brands, SaaS platforms, or whatever industry you’re in.
- Confirm platform fluency – If you use Klaviyo, HubSpot, Braze, or Mailchimp, they need to be experts at it, not just familiar with it.
- Check product-cycle knowledge – They should understand your buyer journey and how it shapes your email marketing campaigns.
- Look for market familiarity – Many email marketing firms specialize in specific verticals; choose one that specializes in yours.
4. Assess their automation strategy.
Automation is where real scale happens. Your email agency should know how to set up and optimize flows that keep revenue coming in around the clock.
- Evaluate their flow library – Ensure that their previous welcome sequences, abandoned cart, post-purchase, and reactivation flows for previous clients mirror what you want for your company.
- Ask about behavioral triggers – They should tie email automation to audience actions for maximum personalization.
- Request automation maps – Seeing the structure of their buyer journeys can reveal how organized (or messy) they are.
- Check audit frequency – Strong email marketing services regularly review and optimize automations to keep getting good outcomes.
5. Look for ROI-driven reporting.
An agency’s reporting tells you whether they’re serious about revenue or just vanity metrics.
- Demand actionable reports – Check for revenue per send, CLTV, campaign performance, not just impressions, clicks, and opens.
- Request A/B testing insights – The right email agency will A/B test things like email headlines, visuals, copy, CTA button colors, and send times to find the combinations that resonate most with your target audience.
- Ask for insights, not just data – The best agencies turn numbers into decisions that improve future campaigns.
6. Understand the team behind the work.
The structure of the agency’s team can make or break your experience. You’re not just hiring email marketing services—you’re hiring people.
- Clarify roles – Ask to speak with their strategist, copywriter, designer, and automation specialist to learn how they work and how they plan to handle your campaigns.
- Confirm account ownership – Know exactly who manages your campaigns and how often you’ll review progress.
- Check onboarding and launch timelines – Delays kill momentum; the agency’s process should be efficient and predictable.
- Understand communication tools – Ask if they use tools like Slack, Asana, or other project management platforms to keep both you and their internal team aligned.
7 best email marketing agencies
Here’s a breakdown of seven vetted email marketing agencies you can consider hiring:
1. InboxArmy - Full-service email and SMS marketing for brands of all sizes
InboxArmy is a specialized email marketing agency that handles everything from strategy and creative to deployment and deliverability.
With a global team of 120+ certified experts fluent in 40+ email platforms (including Klaviyo, Mailchimp, HubSpot, and Salesforce Pardot), they’ve built, launched, and optimized campaigns for over 5,000 companies in 25+ industries. They focus 100% on email and SMS—no SEO, no social, no PPC—so every campaign is backed by deep channel expertise.
Whether you need high-volume sends, complex automations, or industry-specific personalization, InboxArmy builds programs tailored to your brand’s goals, audience, and market realities.
Best for: Startups, mid-market brands, and enterprises that need help managing large-scale, multi-platform email marketing campaigns and SMS programs.
Industries served: Consumer goods, restaurants, B2B, beauty, health and wellness, home and lifestyle, sports and outdoors, healthcare, real estate, education, government and NGOs, manufacturing, transportation, and technology
Services: Email strategy and audit, email campaign management, email automation and deliverability, SMS marketing, email template design
Past clients: Airbnb, Barry University, eBay, Expedia, Spotify
2. Flowium - Email and SMS marketing for eCommerce brands
Flowium is an email and SMS marketing agency built specifically for eCommerce brands that want sustainable, measurable growth. As an Elite Klaviyo Partner, they pair deep technical expertise with a relationship-driven approach, acting as an extension of your team rather than an outside vendor.
Their process blends proven lifecycle strategies with constant optimization, ensuring campaigns drive revenue over the long term. Every client engagement is grounded in trust, transparency, and genuine investment in brand success.
From onboarding and product immersion to advanced segmentation and automation, Flowium delivers email marketing programs designed to scale with your business.
Best for: Direct-to-consumer (DTC) eCommerce brands that want a dedicated partner to manage Klaviyo-powered email and SMS programs.
Industries served: Fashion and apparel, health and wellness, interior décor
Services: Email marketing, SMS services, email audit, email deliverability, email automation, list segmentation, A/B testing and optimization, and custom creatives (copy and template designs)
Past clients: Andrea Iyamah, BetterBrand, Dr. Squatch, Maison Kitsuné Paris, Swoon
3. Rejoiner - Lifecycle email marketing to maximize conversions and retention
Rejoiner is a lifecycle-focused email marketing agency that helps brands turn email into a reliable, high-performing revenue channel.
With over a decade in business and a team bringing 40+ years of combined experience, they’ve developed a refined, repeatable methodology that consistently delivers results, often increasing email-driven sales by 30% or more.
Their approach emphasizes retention, lifecycle optimization, and brand elevation, allowing businesses to free up internal resources while knowing their email program is generating consistent ROI.
Best for: Established eCommerce, SaaS, and DTC brands that want to run retention-driven email programs with a focus on revenue growth.
Industries served: Automotive, clothing and apparel, food and beverage, eCommerce, entertainment, home appliances, etc.
Services: Audience health, email strategy, copywriting, mobile-responsive email design, template creation, performance monitoring, testing, and optimization
Past clients: California Academy of Sciences, Good Housekeeping, Guess, Human Scale, Men’s Health
4. Hustler Marketing - Data-driven email marketing for scalable eCommerce growth
Hustler Marketing is an award-winning email marketing agency that prioritizes measurable results over buzzwords.
Specializing in retention marketing for eCommerce brands, they focus on improving key metrics like click-through rates, customer lifetime value, and placed order rates, while building strategic, engaged email lists.
Their approach blends data with agility, as they constantly test, learn, and pivot to strategies that deliver the strongest ROI. In addition to email, they offer UGC-powered ad services to create a cohesive buyer journey from acquisition to retention.
Best for: ECommerce brands across diverse verticals that want to run advanced email automation and optimize deliverability.
Industries served: Apparel, accessories, wellness, kitchenware, beauty, skincare, jewelry, petcare, furniture, kids’ products
Services: Email marketing, SMS marketing, UGC ads, ad creatives, HubSpot CRM solutions
Past clients: Salad Code, Sun Warrior, Tao Clean, The Pod Company, Vegan Lifemoss
5. Brenton Way - Funnel-first first email marketing with advanced automation
Brenton Way is a growth marketing agency with a dedicated email marketing arm built to turn subscriber engagement into sales.
Their approach starts with segmentation and personalization, delivering content tailored to each audience segment to build trust, boost open and click-through rates, and drive conversions.
As a HubSpot and Klaviyo partner, this agency integrates best-in-class technology into every campaign, enabling personalization and smooth performance tracking.
Best for: B2B and B2C brands that want a funnel-driven email marketing strategy backed by advanced automation, deep personalization, and tight integration with leading platforms like HubSpot and Klaviyo.
Industries served: Automotive, beauty, consumer goods, crypto, dental, eCommerce, sports, fine jewelry, fitness, gaming and eSports, health, law, NFT, hospitality, SaaS
Services: Email marketing (with A/B testing, optimization, and deliverability management), SEO, paid media, social media, influencer marketing, digital PR, content marketing, brand identity, brand conversion
Past clients: Cleure, Family First, Foreo, Parfaire, Shevy’s
6. SmartMail - Revenue-focused email marketing for eCommerce and D2C brands
SmartMail is an eCommerce-focused email marketing agency that manages every aspect of the email marketing process—from campaign creation to profitable automation—so brands can focus on other parts of their business.
Their in-house experts have extensive experience with the complexities of email service providers (ESPs) like Klaviyo, Mailchimp, and more, handling everything from template design and copywriting to scheduling, testing, and optimization.
SmartMail also offers SMS marketing, enabling integrated multi-channel campaigns that maximize engagement and sales. With a team that tailors strategies to each brand’s goals, they deliver lightning-fast email sprints and long-term, revenue-driven lifecycle programs.
Best for: ECommerce and DTC brands looking to manage email and SMS campaigns and automation.
Industries served: Accessories, apparel, homeware, home décor, etc.
Services: Email strategy, email design, list management, SMS marketing
Past clients: Browze, Choxi, DJ City, January Labs, Pat Pat
7. SeeResponse - B2B email marketing and automation for SaaS growth
SeeResponse is a full-service B2B agency that helps SaaS startups and larger tech companies turn email into a profit-generating channel.
Recognized by Clutch as a Market Leader in the Email Marketing category, they specialize in planning, building, and executing end-to-end campaigns, from product launches and automated drip sequences to newsletters and transactional messages.
Their team works closely with in-house staff to blend strategic guidance with hands-on execution, leveraging deep expertise in leading ESPs and MarTech platforms like HubSpot, SendGrid, Mailchimp, ActiveCampaign, and Campaign Monitor.
Best for: SaaS startups and B2B tech companies that want a strategic partner to run elaborate email marketing and automation programs, integrate seamlessly with in-house teams, and drive measurable growth.
Industries served: SaaS, nonprofits, education, healthcare, professional services, information technology
Services: Email strategy development, email design, campaign creation and delivery, list segmentation, editorial calendar management, marketing automation setup
Past clients: Curacubby, Knack, VWO, Glewee, KindKatch
When to choose MarketerHire for email marketing
Sometimes, you don’t need a full email marketing agency; you need a proven email marketing expert who can jump in fast, work alongside your existing team, and start driving results in a few weeks, not months.
MarketerHire can help with that by connecting you with a seasoned email marketing expert from our curated pool of pre-vetted marketing specialists.
Here are the situations where hiring an email marketing specialist through MarketerHire is a smarter move than onboarding an agency:
- Launching a new product – When you’re bringing a new product to market, you can’t afford weeks of agency onboarding. A vetted email specialist can create launch campaigns, design templates, and set up email automation that’s ready to send in days.
- Fixing underperforming flows fast – If abandoned cart, welcome, or post-purchase sequences aren’t converting, an email marketing expert can audit, optimize, and relaunch them quickly.
- Avoiding agency overhead or delays – Agencies often bundle email marketing into larger services, which means higher costs and slower execution. With a dedicated expert, you get focused expertise on your specific needs without paying for extras you don’t use.
- Scaling for seasonal or promotional campaigns – If you need extra email marketing help for Black Friday, Back To School, or other holiday sales, a specialist can help you manage the surge without overloading your staff.
- Setting up email automation from scratch – Whether you’re migrating platforms or starting fresh, an expert can design workflows, segmentation, and triggers that align with your business goals and brand voice.
- Running targeted SMS and email campaigns – For multi-channel impact, email specialists can integrate SMS into your campaigns, creating unified flows that convert more subscribers into paying customers.
- Replacing or supporting in-house talent – If a key team member leaves or your marketing team is stretched thin, you can plug in an experienced professional who already knows the major email tools and industry best practices.
With MarketerHire, you’re not committing to long retainers; you’re getting on-demand access to specialists who have a history of delivering high-quality results for clients across industries. It’s a flexible, results-driven alternative to the traditional marketing agency model.
Email marketing agency vs. freelance email expert vs. email marketing specialist via MarketerHire
If you’re still struggling to choose whether to onboard an agency, hire a freelance expert, or hire a dedicated email expert from MarketerHire, here’s a table breaking down the pros and cons of each model:
Email marketing going forward.
Whether you’re running an eCommerce store, scaling a SaaS product, or managing a B2B brand, the right email marketing partner can turn your subscriber list into a consistent, high-ROI channel.
If you’re ready to improve your email marketing but don’t want the overhead, long onboarding, or rigid retainers that come with a traditional agency, MarketerHire can help.
We connect you with pre-vetted email marketing experts, including email strategists, copywriters, designers, and automation specialists, matched to your needs in 48 hours or less. Every expert has a track record of delivering measurable results, and you only pay for the time you need.
To learn more about how MarketerHire can help you, reach out to us today.
