Email still pays back more than almost any channel. In Litmus’s research on email ROI, 35% of companies see $10 to $36 for every $1 they spend, and another 30% see $36 to $50. But that return depends on the email reaching the inbox. Validity’s State of Email 2024 found average inbox placement of 86%, with 7% going straight to spam. Since February 2024, Gmail and Yahoo have also enforced strict rules for bulk senders.
So an email marketing agency has two jobs: getting your email delivered, and making it earn once it lands. We compared 9 agencies on both, plus pricing, proof and fit for B2B. SeeResponse wrote this list and ranks itself first. The scoring method and the source for every fact are below. Facts come from each agency’s website and Clutch profile, checked in September 2026.
The 9 best email marketing agencies at a glance
| Rank | Agency | Best for | Based in | Clutch rating | Published pricing or minimum | Score |
|---|---|---|---|---|---|---|
| 1 | SeeResponse | B2B companies that want email tied to pipeline, including cold email | McLean, VA | 4.8 (36 reviews) | Retainers from $2,500 to $7,500 a month, month to month | 91 |
| 2 | InboxArmy | Full-service email and SMS on almost any platform | Grapevine, TX | 4.9 (71 reviews) | $1,000+ minimum project | 79 |
| 3 | SmartBug Media | HubSpot-based email and marketing automation | Newport Beach, CA | 4.9 (38 reviews) | $150 to $199 an hour | 75 |
| 4 | Belkins | B2B cold email and appointment setting | Denver, CO | 4.9 (234 reviews) | $1,000+ minimum project | 72 |
| 5 | Email Uplers | Email production at volume across 50+ platforms | Not stated | No separate profile for its email team | Project, wallet or dedicated-resource pricing | 69 |
| 6 | Flowium | Ecommerce lifecycle email on Klaviyo | Staten Island, NY | 4.9 (23 reviews) | $1,000+ minimum; no long-term contracts | 66 |
| 7 | Hustler Marketing | Ecommerce email and SMS | Jackson, WY | 5.0 (17 reviews) | $5,000+ minimum project | 60 |
| 8 | Thrive | Email as part of a wider digital marketing program | Arlington, TX | 4.6 (111 reviews) | $1,000+ minimum project | 55 |
| 9 | Action Rocket | Email design and HTML development | London, UK | No rating shown | $1,000+ minimum project | 52 |
Clutch ratings, minimums, hourly rates and locations come from each agency’s Clutch profile. Pricing terms come from the agencies’ own websites. Scores are out of 100.
Email marketing in 2026: the numbers that matter
| Finding | Source |
|---|---|
| 35% of companies see $10 to $36 back for every $1 spent on email; 30% see $36 to $50; 5% see more than $50 | Litmus, The ROI of Email Marketing |
| Average inbox placement is 86%, and 7% of email lands in spam | Validity, State of Email 2024 |
| 70% of all opens are now generated by Apple’s privacy proxy, so open rates overstate engagement | Validity, State of Email 2024 |
| Average open rates run from 27.34% (vitamin supplements) to 40.55% (government) by industry | Mailchimp Email Marketing Benchmarks |
| 73% of B2B marketers distribute content through email newsletters and 66% through email | Content Marketing Institute, B2B Benchmarks 2024 |
| 44% of B2B marketers name email among the channels that perform best | Content Marketing Institute, B2B Benchmarks 2024 |
| 21% of marketing leaders don’t measure email ROI at all | Litmus, The ROI of Email Marketing |
Two of these change how you should judge an agency. First, about 1 email in 14 lands in spam (Validity’s 7%), so deliverability work comes before design. Second, Apple’s privacy proxy inflates open rates, so an agency that reports opens as its main result is reporting a number you can’t trust. Ask for clicks, replies, meetings and revenue.
The Gmail and Yahoo sender rules every agency must meet
Since February 1, 2024, Gmail and Yahoo require bulk senders to meet these standards. An agency that can’t set them up for you will lose your email to spam folders.
| Requirement | Gmail | Yahoo |
|---|---|---|
| Authenticate with SPF and DKIM | Required for bulk senders | “Implement both SPF & DKIM” |
| Publish a DMARC policy | Required for bulk senders | “At least p=none”, and DMARC must pass |
| Keep spam complaints low | Below 0.30% in Postmaster Tools | Below 0.3% |
| One-click unsubscribe | Required for marketing email | Required |
Sources: Google Email sender guidelines and Yahoo Sender Best Practices.
How we scored each agency
| Criterion | Weight | What earns points |
|---|---|---|
| Email depth and deliverability | 20 | Email is a core service, with authentication, list hygiene and sender reputation handled in-house |
| B2B fit | 20 | Experience with long sales cycles, buying groups, CRM handoff and cold email for B2B |
| Pricing and terms | 20 | Published pricing, reachable minimums and no long lock-in |
| Proof | 15 | Named clients, published results and verified reviews |
| Pipeline connection | 15 | Email reporting tied to leads, meetings and revenue in your CRM |
| Platform coverage | 10 | Experience across the email platforms B2B teams use: HubSpot, Salesforce, Marketo, ActiveCampaign, Mailchimp |
1. SeeResponse
Best for: B2B companies that want email marketing, marketing automation and cold email run as one program and tied to pipeline. Score: 91/100
| Based in | Founded | Team | Clutch | Pricing |
|---|---|---|---|---|
| McLean, VA | 2019 | 10 to 49 | 4.8 from 36 reviews | $2,500 to $7,500 a month for most retainers; month to month |
SeeResponse is a full-service email marketing agency for B2B companies. It plans, builds and runs campaigns, automations and cold email, and works in HubSpot, ActiveCampaign, Mailchimp and Pardot. Clutch lists email as 45% of its work. Because the same team runs HubSpot and CRM, outbound and SEO, email results are reported as meetings and pipeline alongside opens and clicks.
Strengths
- Deliverability-led results: in its Joovv case study, email revenue rose 36% after SeeResponse rebuilt list hygiene, sender reputation and campaigns.
- Runs both permission-based email and cold email, which B2B teams usually buy from two vendors.
- Published pricing and month-to-month terms.
Limitations
- Built for B2B. Ecommerce brands that live in Klaviyo and SMS will get more from Flowium or InboxArmy.
- A team of 10 to 49, so very high-volume template production is better suited to Email Uplers.
2. InboxArmy
Best for: Companies that want a dedicated email and SMS team on almost any platform. Score: 79/100
| Based in | Founded | Team | Clutch | Pricing |
|---|---|---|---|---|
| Grapevine, TX | 2016 | 50 to 249 | 4.9 from 71 reviews | $1,000+ minimum project; $100 to $149 an hour |
InboxArmy is a full-service email marketing agency. Email is 70% of its work on Clutch, and its site says it supports clients across 40+ email service providers, including Klaviyo, Salesforce, HubSpot, Mailchimp and Marketo. Its case studies include Maven Lane, with $700K+ in revenue in six months.
Strengths
- Email is the core discipline, with deep platform coverage.
- 4.9 on Clutch from 71 reviews.
Limitations
- Several of its highlighted case studies are ecommerce brands.
- Email and SMS only; SEO, outbound and CRM need other partners.
3. SmartBug Media
Best for: Companies that run marketing on HubSpot and want email, automation and CRM from one partner. Score: 75/100
| Based in | Founded | Team | Clutch | Pricing |
|---|---|---|---|---|
| Newport Beach, CA | 2007 | 250+ | 4.9 from 38 reviews | $150 to $199 an hour |
SmartBug Media describes itself on Clutch as a three-time HubSpot North America Partner of the Year. Email and automation sit inside a wider inbound, paid media and RevOps offering.
Strengths
- Very deep HubSpot expertise across marketing, sales and service.
- Strong review record.
Limitations
- Email is one service among many.
- No published retainer pricing.
4. Belkins
Best for: B2B companies that want cold email and appointment setting to book meetings. Score: 72/100
| Based in | Founded | Team | Clutch | Pricing |
|---|---|---|---|---|
| Denver, CO | 2017 | 50 to 249 | 4.9 from 234 reviews | $1,000+ minimum project; under $25 an hour |
Belkins is a B2B lead generation and appointment setting agency. Its services include cold email outreach, cold calling and LinkedIn lead generation, and it has the most Clutch reviews on this list.
Strengths
- 234 Clutch reviews at 4.9.
- A clear B2B outbound focus.
Limitations
- Email marketing is 10% of its work on Clutch; its core is sales outsourcing.
- Suited to outbound, less to newsletters, nurture and lifecycle email.
5. Email Uplers
Best for: Teams that need email templates and campaigns produced at volume across many platforms. Score: 69/100
| Based in | Founded | Team | Clutch | Pricing |
|---|---|---|---|---|
| Not stated | Not stated | 150+ experts | No separate profile for its email team | Project-based, wallet or dedicated-resource models |
Email Uplers is a full-service email marketing company with a team of 150+ experts, according to its site. It supports 50+ email platforms, including Mailchimp, Pardot, Salesforce, Marketo, HubSpot and Klaviyo, and offers template production, campaign management, automation and ESP migration.
Strengths
- Wide platform coverage and production capacity.
- Flexible pricing models, including dedicated resources.
Limitations
- No Clutch profile specific to its email business to check reviews against.
- Production-led; strategy and B2B pipeline reporting are less central.
6. Flowium
Best for: Ecommerce brands that want lifecycle email on Klaviyo. Score: 66/100
| Based in | Founded | Team | Clutch | Pricing |
|---|---|---|---|---|
| Staten Island, NY | 2017 | 10 to 49 | 4.9 from 23 reviews | $1,000+ minimum; no long-term contracts; 2-year price lock |
Flowium builds retention-driven lifecycle marketing for ecommerce brands, with email at 60% of its work on Clutch. Its site promises transparent pricing, no long-term contracts and a two-year price lock.
Strengths
- Clear terms: no long-term contracts and a price lock.
- Deep Klaviyo expertise.
Limitations
- Ecommerce-focused, so less suited to B2B sales cycles.
7. Hustler Marketing
Best for: Ecommerce brands that want email and SMS managed together. Score: 60/100
| Based in | Founded | Team | Clutch | Pricing |
|---|---|---|---|---|
| Jackson, WY | 2018 | 50 to 249 | 5.0 from 17 reviews | $5,000+ minimum project |
Email is 65% of Hustler Marketing’s work on Clutch. Its case studies include Penn Tools, and its site says it prices email flows as a one-time build and ongoing campaigns as a monthly retainer.
Strengths
- A perfect 5.0 across 17 Clutch reviews.
- Clear split between build costs and ongoing retainers.
Limitations
- Ecommerce-focused.
- Higher minimum than most on this list.
8. Thrive
Best for: Businesses that want email as one part of a broader digital marketing program. Score: 55/100
| Based in | Founded | Team | Clutch | Pricing |
|---|---|---|---|---|
| Arlington, TX | 2005 | 50 to 249 | 4.6 from 111 reviews | $1,000+ minimum project; $100 to $149 an hour |
Thrive is a full-service digital marketing agency with an email marketing service covering segmentation, automation and campaigns. Clutch lists SEO as 70% of its work.
Strengths
- 111 Clutch reviews.
- One agency for SEO, paid, social and email.
Limitations
- Email isn’t a primary discipline on Clutch.
- Its Clutch profile shows no B2B specialty.
9. Action Rocket
Best for: Brands and agencies that need standout email design and clean HTML. Score: 52/100
| Based in | Founded | Team | Clutch | Pricing |
|---|---|---|---|---|
| London, UK | 2011 | 10 to 49 | No rating shown | $1,000+ minimum project; $25 to $49 an hour |
Action Rocket calls itself the creative studio for the email channel, providing creative strategy, design and best-practice HTML development for brands, agencies and email service providers.
Strengths
- Specialist email design and development.
- Low hourly rates on Clutch.
Limitations
- Design and build only; strategy, deliverability and campaign management sit elsewhere.
- UK-based, with no Clutch reviews shown.
What does an email marketing agency cost?
| Budget | What it buys | Examples from this list |
|---|---|---|
| Under $2,500 a month or per project | Template design, one-off builds, audits | Action Rocket ($25 to $49 an hour); Email Uplers project pricing |
| $2,500 to $7,500 a month | A managed program: strategy, campaigns, automation and deliverability | SeeResponse |
| $5,000+ per project | Larger ecommerce lifecycle programs | Hustler Marketing ($5,000+ minimum) |
Most agencies here start at a $1,000 minimum project on Clutch, with hourly rates from under $25 (Belkins) to $150 to $199 (SmartBug). The platform itself (HubSpot, Klaviyo, Mailchimp) is billed separately.
How to choose an email marketing agency
- Start with deliverability. Ask how the agency sets up SPF, DKIM and DMARC, and how it keeps spam complaints under Gmail’s 0.30% line.
- Match the agency to your model. B2B email nurtures buying groups over months and hands leads to sales. Ecommerce email drives repeat purchases. Few agencies do both well.
- Ask what they report. With 70% of opens coming from Apple’s privacy proxy (Validity), open rates alone mislead. Ask for clicks, replies, meetings and revenue.
- Check platform experience. Make sure the agency has run programs on your platform, or has a plan to migrate you.
- Read the contract. Month-to-month terms keep the agency earning its fee.
Questions to ask on the first call
- How will you authenticate our domain and monitor our sender reputation?
- What did you change for a client like us, and what happened to revenue or pipeline?
- How do you report email’s effect on leads and sales?
- Do you run cold email as well as marketing email, and how do you keep them from hurting each other’s deliverability?
- What does our fee cover each month, and what’s the notice period?
Frequently asked questions
What does an email marketing agency do?
An email marketing agency plans, builds and runs your email program. That covers strategy, list growth and segmentation, campaign and newsletter design, automation such as welcome and nurture sequences, deliverability, and reporting. B2B agencies also connect email to the CRM so sales can see which contacts engage.
Is email marketing still worth it in 2026?
Yes. In Litmus’s research, 35% of companies see $10 to $36 back for every $1 spent, and 30% see $36 to $50. Email is also one of the channels B2B marketers use most: 73% distribute content through email newsletters (Content Marketing Institute).
What are the Gmail and Yahoo bulk sender requirements?
Since February 1, 2024, senders of bulk email to Gmail and Yahoo must authenticate with SPF, DKIM and DMARC, offer one-click unsubscribe, and keep spam complaint rates below 0.3%. See Google’s sender guidelines and Yahoo’s best practices.
Why is SeeResponse ranked first?
We wrote this list, so we published our scoring method and a source for every fact. SeeResponse scores highest because it’s built for B2B, starts with deliverability (as its Joovv results show), runs marketing email and cold email together, reports email against pipeline, and publishes month-to-month pricing. For ecommerce email on Klaviyo, Flowium or InboxArmy will suit you better.
Related reading
- 10 best B2B marketing agencies and companies in 2026
- 10 best B2B SEO agencies in 2026, scored and compared
Talk to SeeResponse
If you want email that lands in the inbox and shows up in your pipeline, book a 20-minute call. We’ll look at your sender setup, your lists and your automations, and tell you where the revenue is leaking.