For every $1 invested in email marketing, you earn an average of $36 back.
Yep, that’s a staggering 3,600% ROI.
So, how do you turn inbox interest into conversions before someone else does?
That’s where the right email marketing agency comes in.
They bring the strategy, creativity, and data smarts to help your brand stand out, convert more, and grow steadily. Some of the email marketing agencies include:
In this guide, we’ll take a closer look at 10 of the best email marketing agencies to help you compare their key services and pricing, so you can find the best email marketing agency for your brand.
Keep Exploring:
- Explore 10 of the best email designs proven to boost clicks and open rates.
- Then, see how Constant Contact stacks up against Mailchimp to find the right email marketing tools for your needs.
10 Best Email Marketing Agencies: Key Services, Clients, and Pricing
Let’s start off with a quick comparison of the top email marketing agencies, highlighting their expertise, clients, and pricing before we take a closer look at what makes them stand out:
1. Designity
Based in New York City, Designity operates on a Creative-as-a-Service (CaaS) model, a modern, scalable alternative to traditional email marketing agencies.
Instead of juggling freelancers or committing to high-cost retainers, you get on-demand access to the top 3% of US-based creative talent, from email designers and copywriters to automation experts and developers, all guided by Creative Directors.
We’ve partnered with leading brands like Calendly, Audible, Kung Fu Tea, and Marriott Hotels, helping them bring high-performing creative ideas to life.
From personalized email marketing campaigns that increase ROI to cohesive rebrands and automated customer journeys that drive loyalty, we turn smart creative strategy into measurable results.
Why Choose Us?
- Access over 100+ creative services, from strategy to design and automation
- Save up to 70% compared to agency retainers
- 3x faster turnaround than managing freelancers
- Strategic oversight from Creative Directors with 10+ years of experience
- AI-powered workflows that improve speed and consistency
- Flexible month-to-month plans with no long-term contracts
- Two-week trial, no upfront payment required
Our Key Email Marketing Services:
- Email Design Services
- Email Template, Newsletter, & Signature Services
- Email Automation & Campaign Creation Services
- Email Subject Line Strategy & Copywriting Services
- Email Custom Coding & CRM-Built Services
Pricing: Designity’s flat-rate subscription model makes high-quality email marketing accessible and scalable for businesses of all sizes. Our Plus Plan (entry tier) starts at:
- Monthly: $5,995/month
- Quarterly: $5,495/month
- Annually: $5,095/month
This plan includes:
- 120 dedicated creative hours/month
- 2 active creatives/projects simultaneously
- 24-hour turnaround on minor requests
- 4 hours/month of Creative Director consultation
- 1 brand-trained AI agent
- Full copyright ownership
- Unlimited requests, revisions, and storage
- Access to 100+ creative services
Need more capacity? Scale effortlessly by adding more creatives or hours as your campaigns and customer base grow.
Book a demo today to see why leading brands choose Designity for email marketing that’s faster, smarter, and built for results.
2. Add People
Add People helps small and mid-sized businesses grow smarter with tailored digital strategies across PPC, SEO, social media, eCommerce, and web design.
As trusted partners of Google, Meta, and Microsoft Advertising, they’ve helped brands like Mudd Concrete and Exersci boost revenue and visibility through creative, conversion-driven marketing.
Key Email Marketing Services:
- Email campaign strategy and automation
- Customer segmentation and personalization
- Newsletter and promotional design
- A/B testing and optimization
- CRM and workflow integration
- eCommerce email campaigns and abandoned cart flows
Pricing: Custom, book a free one-on-one strategy session for tailored email marketing pricing and insights.
3. InboxArmy
InboxArmy lives up to its name — a full-force team of email pros helping brands of all sizes master their inbox game.
Based in Texas, they’ve partnered with 5,000+ businesses, including Hilton, Spotify, and Procter & Gamble, to craft custom strategies, automate campaigns, and boost deliverability across email marketing software like Klaviyo, HubSpot, and Salesforce Marketing Cloud.
Key Email Marketing Services:
- Email strategy and audits
- Campaign management and automation email flows
- Template design and HTML coding
- Deliverability optimization
- ESP migration and vendor evaluation
- SMS marketing and push notifications
Pricing: Custom, tailored to your business goals and scope.
4. MH Digital Group
MH Digital calls itself your “Email & Lifecycle Marketing Co-Pilot” — and for good reason.
Based in Denver, this team blends strategy, creativity, and technical know-how to turn email and SMS into serious growth engines.
They’ve helped brands like Purina, Les Schwab Tires, Kaiyo, and Flex boost retention, automate journeys, and drive revenue with smart, data-backed campaigns.
Key Email Marketing Services:
- Email and SMS campaign strategy
- Lifecycle automation and flow development
- Copywriting, design, and HTML development
- Segmentation and personalization
- ESP setup, audits, and integration (Klaviyo, Braze, Shopify, etc.)
- Reporting and revenue optimization
Pricing: Custom, tailored to business size and lifecycle needs.
5. WebFX
With nearly 30 years in the game, WebFX is a data-driven powerhouse helping brands turn emails into revenue.
Using their proprietary RevenueCloudFX platform, they’ve helped clients like ZAGG, Net Friends, and Hurst Pediatric Dentistry boost sales and engagement through personalized, automated campaigns backed by strategy, design, and measurable ROI.
Key Email Marketing Services:
- Lead nurture and lifecycle email campaigns
- Email strategy, design, and automation
- Segmentation and personalization
- ROI and conversion tracking with RevenueCloudFX
- CRM and ESP integration
Pricing: Starts at $300/month, customized per campaign scope and business goals.
6. Sweat Pants Agency
Their name might sound laid-back, but their email marketing results are anything but.
Sweat Pants Agency has built two INC 500 #1 brands from scratch, SnapCare and Hunt A Killer, proving their growth chops.
From Nashville, this data-driven team has sent 4.3B emails and 147M texts, scaling brands like Kinder Beauty, Hustle Butter, Crafters Box, Sugarwish, and Kitty Poo Club with creative, testing-obsessed lifecycle campaigns that convert.
Key Email Marketing Services:
- Strategy & campaign management
- Automation & customer journeys (Klaviyo, etc.)
- List growth, popups & segmentation
- Deliverability & compliance
- Creative: on-brand copy/design
- Data-driven optimization, testing & reporting
- Integrations across ESPs, CRM, and ecommerce
Pricing: Custom. Free email audit and strategy call available.
7. SmartMail
SmartMail is an eCommerce email marketing agency that’s all about done-for-you results.
With over 11 billion emails sent for 150+ brands like Lowes, Seafolly, PatPat, and City Chic, they combine strategy, design, and automation to consistently deliver ROI-driven campaigns and measurable growth.
Key Email Marketing Services:
- Email campaign management & automation flows
- Email design & ESP setup (Klaviyo, Mailchimp, etc.)
- List management & growth strategy
- SMS marketing
- Free email marketing audit
- Welcome, cart abandonment, post-purchase, and retention flows
Pricing: Performance-based, “no retainer” model — you pay only for what’s produced. Free consultation and audit available.
8. Action Rocket
ActionRocket doesn’t just send emails; they launch them into orbit.
Blending design, code, strategy, and storytelling, this London-based agency creates high-impact CRM and email experiences that are as innovative as they are effective.
Some of their most notable clients include Net Jets, The Body Shop, and Econsultancy.
Key Email Marketing Services:
- Email campaign & CRM program design
- AMP & interactive email coding
- SMS, WhatsApp, push, and in-app messaging
- Content creation & brand storytelling
- Responsive, accessible development
Pricing: Tailored per project.
9. Flowium
Flowium is a Klaviyo-focused agency that has generated over $1B in email and $103M in SMS revenue through data-driven lifecycle strategies.
With clients like Maison Kitsuné, Balsam Hill, and BetterBrand, Flowium blends smart automation and sharp strategy to turn every message into momentum.
Key Email Marketing Services:
- Full-service email marketing strategy
- SMS marketing and automation
- Email audits and deliverability optimization
- Customer segmentation and personalization
- Dedicated Klaviyo account management
Pricing: Transparent, project-based pricing with no long-term contracts or retainers. Free consults are also available.
10. The Email Marketers
With a name like The Email Marketers, you’d think they just send emails, but they do so much more.
This retention-obsessed crew turns clicks into customers (and customers into superfans) through smart email, SMS, and loyalty strategies.
Their AI-powered insights and creative execution have helped brands like Kick Game, Llama Naturals, and Prime Neckwear generate millions, over $51M in 2024 alone.
Key Email Marketing Services:
- Email & SMS strategy powered by AI-driven insights
- Lifecycle automations and campaign management
- List growth and deliverability optimization
- Subscription, referral, and loyalty program management
- Direct mail and omnichannel retention marketing
Pricing: Custom pricing based on goals and scale.
10 Best Practices for Choosing the Right Email Marketing Agency
Here are 10 practical tips to help you find and partner with the right email marketing agency for your brand:
- Get clear on your goals: Know what success looks like, whether that’s growing your subscriber list, improving open and click rates, or boosting conversions through smarter automation.
- Look for email-specific expertise: Choose an agency that lives and breathes email. They should understand deliverability, segmentation, A/B testing, and any email marketing platform you use (like HubSpot, Klaviyo, or Mailchimp).
- Ask for case studies: Review real examples of campaigns that drove measurable results, like higher engagement, more sales, or stronger customer retention.
- Read client testimonials: Check reviews on Google, Clutch, or Trustpilot. Look for clients who mention strong communication, consistency, and clear ROI from their campaigns.
- Evaluate their creative quality: Browse their portfolio of email templates, newsletters, and copy. If it doesn’t feel modern, on-brand, and conversion-focused, keep searching.
- Understand their process: Ask how they handle onboarding, strategy, testing, and reporting. The best agencies are transparent and keep you looped in every step of the way.
- Choose strategy over volume: Don’t fall for agencies that only promise more emails. You want a partner who focuses on data-driven strategy and customer experience, not just output.
- Compare pricing and flexibility: See whether they work on retainers, monthly subscriptions, or per-project pricing, and choose what best fits your team’s pace and budget.
- Meet your account team: Find out who you’ll be working with daily and make sure they understand your audience, voice, and brand goals.
- Try before you commit: Start with a short-term project or pilot campaign. For example, Designity offers a two-week free trial (no upfront cost) so you can experience the quality and workflow before signing on long-term.
5 Email Marketing Trends to Watch in 2026 + How Agencies Can Help
Here are five trends shaping 2026 and how an email marketing agency can help you stay ahead of the curve:
- Around 70% of marketers expect AI to handle up to half of their email marketing tasks by 2026.
Agencies offer the right tech and experience for AI-enhanced subject-line testing, content personalization, and automation, so your campaigns perform better without you managing complex tools.
- Segmented email campaigns drive ~30% more opens and ~50% more clicks than unsliced sends.
An email marketing company will help you build advanced segmentation strategies, tailor messages based on behavior, and turn your list into a high-performing conversion engine.
- 50% of people delete an email the second it looks bad on their phone, so if your campaigns aren’t mobile-friendly, all that effort could vanish with one quick swipe.
An agency knows how to design, code, and test mobile-ready emails across devices, so every message looks great, loads fast, and converts, no matter where it’s opened.
- 59% of consumers say marketing emails influence what they buy, and more than half make a purchase from an email at least once a month.
An agency can help you craft data-driven campaigns with compelling offers and clear calls-to-action that turn subscribers into loyal, repeat customers.
- Around 46% of subscribers say they always open emails from brands that stay consistent and relevant with their messaging.
An agency helps you maintain that steady rhythm, planning, writing, and designing campaigns that keep your target audience engaged and looking forward to every send.
Don’t Just Send Emails — Create Experiences with Designity
The agencies above are all solid picks if you’re looking to boost engagement, grow your list, and drive conversions through great email marketing.
But if you want to scale faster, cut agency costs, and ditch long-term retainers, Designity is your smarter solution.
Through our Creative-as-a-Service (CaaS) model, you get on-demand access to top-tier creative talent, from email designers and copywriters to automation pros, all led by a dedicated Creative Director who ensures every send hits the mark.
Book a demo today and start your 2-week free trial to see how Designity helps brands send smarter, design better, and grow faster.
