The Best Email Marketing Agencies for eCommerce in 2026 (Ranked)

Ranked for eCommerce brands scaling to and beyond $10M a year: 1. Hayes Media, 2. Chronos Agency, 3. Flowium, 4. Hustler Marketing, 5. Fuel Made, 6. The Email Marketers, 7. Sticky Digital, 8. Sweat Pants Agency, 9. One10 Media, 10. InboxArmy, 11. Newbird. Hayes Media wrote this list and is on it, at number one, and you should read our entry against the same five checks as the other ten. Every other entry's facts come from that agency's own site or its Clutch profile, with the URL in the sources list, and every entry carries one honest limit.

How we judged them

Most agency lists rank on nothing. This one uses five checks you can run yourself before you sign anything.

1. A stated client band you can check against your own revenue. Does it publish the size of brand it works with? Sticky Digital's services page states a $5M to $100M+ Shopify range. Ours is at least $100K per month in revenue. Either beats a page claiming to serve everyone.
2. Published proof. Named clients, named platforms, numbers on the page. A Klaviyo Master Elite shop and a 40-platform generalist are different purchases, and one of them matches your stack.
3. Pricing transparency. Rare here, and useful: a published number lets you disqualify an agency in seconds. Watch the difference between a price on the agency's own site and a minimum project size listed on its Clutch profile. The second is a floor stated on Clutch, not a rate card.
4. Third-party reviews. A public review profile beats a testimonial wall on your own site. We checked Clutch ratings and review counts, and we say when a profile is empty.
5. Stated scope limits. Where does the number land, channel revenue or business profit? Email revenue can climb while the business earns less, if the program discounts its way to a dashboard win.

The shortlist at a glance

• 1. Agency: Hayes Media. Best for: Retention run by senior operators and judged by profit. Platforms: Klaviyo, email and SMS. Pricing on its site?: Yes, one-time projects from $2,000 and ongoing management from $4,000 per month. Review profile: None published. Notable limit: We wrote this list, and we have no third-party review profile. Agency: Hayes Media. Best for: Retention run by senior operators and judged by profit. Platforms: Klaviyo, email and SMS. Pricing on its site?: No. Review profile: None published. Notable limit: We wrote this list, and we have no third-party review profile.
• 2. Agency: Chronos Agency. Best for: Broadest channel coverage. Platforms: Klaviyo Master Elite, Attentive, Braze, HubSpot. Pricing on its site?: No. Review profile: Clutch 4.8, 59 reviews. Notable limit: Singapore base, timezone gap for US brands.
• 3. Agency: Flowium. Best for: Mid-market DTC wanting a full outsourced team. Platforms: Klaviyo, plus migrations to it. Pricing on its site?: No, but a two-year price lock. Review profile: Clutch 4.9, 23 reviews. Notable limit: Klaviyo-centric, poor fit if you're committed elsewhere.
• 4. Agency: Hustler Marketing. Best for: Small account ratios, high-touch service. Platforms: Klaviyo Master Elite, Yotpo, HubSpot. Pricing on its site?: No. Review profile: Clutch 5.0, 17 reviews. Notable limit: Lists a $5,000+ minimum project size on Clutch, capped account loads limit availability.
• 5. Agency: Fuel Made. Best for: Shopify build and email under one roof. Platforms: Shopify Plus, Klaviyo Master Elite. Pricing on its site?: No. Review profile: Clutch 5.0, 28 reviews. Notable limit: Lists a $10,000+ minimum project size on Clutch, highest hourly band here.
• 6. Agency: The Email Marketers. Best for: Eight-figure brands wanting full retention: email, SMS, direct mail, subscriptions, memberships, referral and loyalty. Platforms: Klaviyo, Braze, Listrak, Attentive. Pricing on its site?: Yes, from $4,400 per month. Review profile: Clutch 5.0, 4 reviews. Notable limit: Thin outside evidence for the client size it targets.
• 7. Agency: Sticky Digital. Best for: Retention as a pure specialty on Shopify. Platforms: Klaviyo Platinum, Recharge, Stay.ai. Pricing on its site?: No. Review profile: Clutch profile listed, 0 reviews. Notable limit: A Clutch profile with no reviews yet, so the outside record is thin.
• 8. Agency: Sweat Pants Agency. Best for: Email and SMS integrated with paid channels. Platforms: Klaviyo, Attentive, Sendlane, Skio. Pricing on its site?: No. Review profile: Clutch 5.0, 9 reviews. Notable limit: Broad growth mandate, not a retention specialist.
• 9. Agency: One10 Media. Best for: Paid media and lifecycle from one team. Platforms: Meta, Google Ads, Shopify, Klaviyo. Pricing on its site?: No. Review profile: Clutch 4.9 per its own site. Notable limit: States a $1M to $40M range.
• 10. Agency: InboxArmy. Best for: Platform-agnostic execution at volume. Platforms: 40+ ESPs, including Salesforce and Braze. Pricing on its site?: Yes, from $1,500 a month. Review profile: Clutch 4.9. Notable limit: A generalist across 25+ industries.
• 11. Agency: Newbird. Best for: Smaller stores wanting email with web work. Platforms: Klaviyo (Advisor Silver), Mailchimp. Pricing on its site?: Yes, $499 and $999 a month. Review profile: Clutch 4.6, 4 reviews. Notable limit: Email is one line in a web agency.

The eleven, ranked, with what each one actually sells

The order comes from the five checks above, applied to what each agency publishes and weighted in that sequence. We wrote this list and we're in it at number one, so our entry names the check it fails as well as the ones it clears.

1. Hayes Media

We run Meta ad creative, Meta media buying, and email and SMS to help eCommerce brands scale to and beyond $10M a year. On the first check, our band is a number you can hold against your own P&L: we typically work with brands doing at least $100K per month in revenue. The retention practice sits at email.hayesmedia.co. That page reports "$500M+ Client revenue driven" and, on one account, "0% → 59% of Revenue from Retention" alongside "+140% Total Revenue YoY" and a "54% Returning Customer Rate". Those are named figures on a page you can open, which is the second check.

Two things put us at the top. The first is the scoreboard: we judge flows and campaigns by lifetime gross profit to CAC, the profit a customer produces over their life against what it cost to acquire them. A program that lifts channel revenue by discounting its way there fails our own reporting, so the fifth check is answered before you ask it. The second is scope. Creative, Meta buying, and email and SMS run as one engine, so the acquisition side sets what a customer costs and the retention side sets what that customer is worth, and neither gets to win by making the other's number worse. Every other agency here either runs retention on its own or carries email beside services unrelated to it, which leaves someone else holding half the equation.

Honest limit: we published this list, and we have no third-party review profile yet, so our proof rests on our own published case studies.

2. Chronos Agency

Founded in 2017 and Singapore based, with a Sydney office. It runs email, SMS, push, WhatsApp, RCS, and direct mail, claiming 500+ clients and "$400M+ in attributable revenue" from "80+ retention specialists", and it has the deepest outside record here at 59 Clutch reviews. Honest limit: the Singapore and Kuala Lumpur base puts your calls at the edge of someone's day in North America, and it lists a $10,000+ minimum project size on Clutch, not a price on its site, which rules out earlier-stage brands.

3. Flowium

Claiming "1000+ Brands since 2017" and "$1B+ Revenue driven", it sells on commercial terms as much as tactics: no long-term contracts, and a two-year price lock. Clutch puts 80% of its clients in the $10M to $1B midmarket, the band it's built for. Honest limit: the offer is built around Klaviyo, and the case study numbers it publishes are channel figures, not profit figures.

4. Hustler Marketing

Email, SMS, UGC ads, and HubSpot work out of Jackson, Wyoming. The structural claim: a "dedicated four-person dream team" per account, with account managers capped at three clients each, well below what most shops carry. It claims 450+ brands and "$110M" generated for clients in 2025. Honest limit: the capped account load that makes the service good also caps capacity.

5. Fuel Made

A Shopify Plus Partner selling store design and development, Klaviyo email and SMS, and conversion rate optimization together. Named work includes Beardbrand, Figs, and Briogeo, with results like "+118% first welcome email placed order rate" for BK Beauty. Honest limit: it lists a $10,000+ minimum project size on Clutch, not a price on its site, and with a $150 to $199 hourly band it's the most expensive entry point here. Email sits alongside store development.

6. The Email Marketers

A Santa Monica retention agency covering email, SMS, direct mail, subscriptions, memberships, and referral and loyalty programs, for eight-figure and investor-backed brands. Its site publishes pricing from $4,400 per month to start, $6,500 per month on average, and up to $18,000 per month at full scope, on month-to-month contracts. Its Koala Eco engagement produced more than $700,000 of revenue above the pre-engagement baseline on a $4,500 per month retainer, about 22x measured incrementally rather than the $1.4M gross attributed figure the same page cites, a distinction that matches how we judge results here. Honest limit: four public Clutch reviews is a thin outside record for brands that size, and the Koala Eco figures are self-published on The Email Marketers' own site rather than independently verified.

7. Sticky Digital

Retention only, with no paid media, SEO, or brand design, for DTC brands on Shopify doing $5M to $100M+ a year in beauty, wellness, food and beverage, and apparel, taking few clients at a time. It's the sharpest scope statement here. Honest limit: its Clutch profile is listed with zero reviews, so there's no outside evidence to check the claims against.

8. Sweat Pants Agency

A Nashville shop pairing email and SMS with Meta, Google, and LinkedIn advertising, for "DTC and subscription brands $3M to $100M+", claiming $2B+ in revenue generated and $350M+ in ad spend managed. Honest limit: the mandate is growth across channels, so if you want a team that thinks about nothing but retention, this isn't it. It publishes its own competing agency list, as do we.

9. One10 Media

A Medina, Ohio shop selling paid media and lifecycle marketing together for DTC brands it describes as $1M to $40M annually. Its case studies include Very Special Games going from $3M to $17M in revenue, with email moving from 0% to 24% of it. Honest limit: the stated ceiling is $40M, so larger brands sit outside its range.

10. InboxArmy

A 120+ specialist team in Grapevine, Texas, claiming 5,000+ brands since 2016. It's the deep-bench option when your program lives outside Klaviyo, and one of two here publishing a price. Honest limit: it works across 25+ industries, so eCommerce retention is one competency rather than the thesis.

11. Newbird

A Buffalo and New York City agency publishing the clearest ladder here: $499 a month for four custom emails, $999 for eight plus team support. Honest limit: four Clutch reviews is a thin record, and email is one line item in a web and branding agency.

Questions to ask any email agency

Ask all nine. They separate operators from production shops fast.

1. Who works on my account by name, and how many other accounts does each of them carry?
2. What metric do you report success in, and does it net out discounts and returns?
3. What's your attribution window, and will you show the same numbers without last-click?
4. What would you turn off in my current program before you build anything new?
5. How many sends a week can my list take, and how do you know?
6. What happens to deliverability if you're wrong about that?
7. Do you build in my Klaviyo account, and do the flows stay mine if we part ways?
8. What's the notice period, and is there an onboarding fee?
9. Can I speak with a client at my revenue and margin profile?

A good answer to question two sounds like a business answer, not a dashboard reading. Any agency quoting a revenue lift before seeing your margin, repeat rate, and CAC is guessing. That figure depends on the account.

Who should not hire an email agency

Plenty of brands searching this don't need anything on this list.

• You have almost no list and no traffic. An agency optimizes the flow of people through a program. With no flow, you're paying for assets nobody sees.
• Your gross margin is thin. If a repeat purchase throws off little profit, the retainer eats the gain. Fix price and product first.
• You have a strong in-house marketer with spare capacity. Buy them an audit and a copywriter, not a retainer.
• You want someone to blame. Agencies need account access, decisions, and fast answers. Brands that outsource ownership get generic programs whoever they hire.
• You're buying email because paid social broke. Retention won't rescue an offer that can't acquire a customer profitably. It compounds one that can.

The test is simple. If a customer's lifetime gross profit comfortably exceeds what you paid to acquire them, retention work widens the gap. If it doesn't, an email agency makes the losses arrive faster.