9 Best Cold Email Agencies for B2B Lead Generation in 2027

A good cold email agency can fill a sales calendar inside a quarter. A bad one can fill it too, briefly, right before your domain lands on a blocklist and half of those "meetings" turn out to be people who replied to ask how you got their address.

Telling the two apart from the outside is harder than it should be. Every roundup for this search seems to crown a different #1, prices are often third-party guesses printed as quotes, and review scores rarely come with a count or a date.

This guide compares nine agencies on things you can check yourself: published prices and minimum terms, Clutch ratings with review counts, and the channels each one actually runs. After the list, you'll find a plain breakdown of what agencies cost and the seven deliverability questions worth asking on the first sales call.

Cold email agencies at a glance

Only four of the nine publish a dollar figure for cold email work, so the starting price column is worth reading alongside the minimum term.

How we chose these agencies

Every agency here runs cold email as a core service for B2B companies, and each one had to clear the same five checks:

• What the agency says publicly about domains, inbox warmup, contact verification and who keeps the infrastructure
• Clutch ratings with the review count, since a 5.0 from one client and a 4.8 from 100 clients are different signals
• Whether a starting price is published, and where it came from
• Contract terms: minimum commitments, pilots and billing cycles
• Channel mix, from email only to email plus LinkedIn and phone

The order isn't a leaderboard. A phone-heavy SDR shop and a cold-email-only specialist solve different problems, so each profile explains who the agency suits and where it falls short. Read those notes before the rank number. Most of the list is younger, founder-led agencies, with Belkins and Martal Group included as established benchmarks. Where a claim comes only from an agency's own website, we say so.

The 9 best cold email agencies for B2B lead generation

1. Reachly

Reachly is a Clay Solutions Partner that books sales meetings through cold email and LinkedIn. It runs the whole campaign, from finding prospects to following up and booking the meeting.

The work starts with message-market fit: the right audience, the right problem and the right offer. For teams new to outbound, Reachly tests all three from scratch. For teams already sending, it fixes the campaigns that get low replies.

As an outsourced SDR team, Reachly builds prospect lists in Clay, writes the emails and LinkedIn messages, and looks for buying signals such as a new hire, new funding or headcount growth. It checks every email before sending to reduce bounces, sends from separate outreach-only domains, and has a person answer replies and book meetings straight into the client's calendar.

Type of Service: Multichannel outbound: cold email, LinkedIn and cold calling, with message testing built in.

Pricing: One flat fee from $3,500 a month, covering testing, data, sending infrastructure, copy, reply handling and meeting booking.

Best For: B2B companies with deals worth $5,000+ a year that want meetings without hiring SDRs, whether they are starting outbound or fixing campaigns that are not working.

Why It Stands Out: Every message is tested before it is scaled, and one team runs the whole process, from building lists in Clay to booking the meeting.

2. Belkins

Belkins is a B2B appointment-setting agency founded in 2017 that runs outbound across cold email, calling, LinkedIn and account-based campaigns, mostly for mid-market and enterprise companies. It has the deepest review record on this list, with 234 Clutch reviews averaging 4.9 (as of November 2026), and it ranks first on Google for "cold email agency," so it's often the first agency buyers talk to.

One team handles several channels at once, which suits companies that want a single outbound partner rather than separate email and calling vendors. That breadth has a cost: if cold email is all you need, you'll pay for channels you don't use.

Read its Clutch  reviews, though. A couple of clients there describe multi-month engagements that produced no leads, which the high Clutch average doesn't show.

Type of Service: Multichannel appointment setting: cold email, cold calling, LinkedIn and account-based marketing.

Pricing: No dollar figures on its pricing page. Its service pages mention programs starting from $5,000, per its website. Minimum term not published.

Best For: Mid-market and enterprise teams that want one partner across several channels and a long review record to check.

Why It Stands Out: 234 verified Clutch reviews, more than any other agency here, so you can test its track record before you sign.

3. Martal Group

Martal Group has supplied outsourced SDR teams since 2009 from Oakville, Ontario, with most of its clients in B2B technology. Clutch lists the company at 250 to 999 employees, and its 109 Clutch reviews average 4.8.

Martal's SDRs are onshore and run omnichannel outbound across email, calling and LinkedIn. The size of the team is the practical advantage: once a program works, Martal can add SDRs without you switching vendors.

The trade-off is time. Per its website, engagements start with a 3 to 4 month pilot, so budget for a full quarter before you judge results.

Type of Service: Outsourced SDR teams running cold email, cold calling and LinkedIn together.

Pricing: Not published. Engagements start with a 3 to 4 month pilot, per its website.

Best For: B2B tech companies that want senior, onshore SDRs and room to scale a program that works.

Why It Stands Out: A large onshore SDR bench backed by a deep Clutch record, which few agencies on this list can match.

4. SalesCaptain

SalesCaptain is an outbound and GTM agency founded in 2021 that builds campaigns around buying signals rather than static lists. It has grown quickly for a young shop: Clutch lists the team at 50 to 249 people, and its 23 Clutch reviews average 4.7 (as of November 2026).

Most programs pair cold email with LinkedIn outreach. Clutch reviewers describe the team handling list building, copy, sending setup and reply management, with CRM work in Salesforce or HubSpot available on top.

Reviewers praise the speed and communication. The criticism that comes up on Clutch is team changes mid-engagement, which some clients said affected quality for a stretch.

Type of Service: Intent-triggered outbound across cold email and LinkedIn, with optional CRM and sales automation setup.

Pricing: Not published. Clutch lists a $5,000 minimum project size, and one reviewer reported paying about $3,500 a month.

Best For: B2B SaaS and service companies that want signal-based email and LinkedIn outreach from a young, well-reviewed team.

Why It Stands Out: A 4.7 Clutch rating across 23 reviews in about five years, with reviewers repeatedly singling out speed and communication.

5. LevelUp Leads

LevelUp Leads runs fractional and full-service outsourced SDR programs across phone, email and LinkedIn from Laguna Beach, California. It was founded in 2021 and has one of the stronger review records among younger agencies, with 61 Clutch reviews at 5.0 (as of November 2026).

The fractional option is the useful part for smaller teams: you can start with a share of an SDR's time and move to a full team once the channel proves itself, without changing vendors.

Payment is prepaid with a three-month initial term, so plan for a full quarter before judging results.

Type of Service: Outsourced SDR programs covering cold calling, cold email and LinkedIn.

Pricing: From $5,000 a month, prepaid, with a three-month initial term, per its website.

Best For: Sales teams that want booked meetings from several channels without managing each one separately.

Why It Stands Out: A choice of fractional or full-service SDR capacity, backed by 61 Clutch reviews at 5.0.

6. Hypergen

Hypergen is a cold email agency founded in 2019, listed on Clutch in Sofia, Bulgaria. It ranks third on Google for "cold email lead generation agency," and its 15 Clutch reviews average 5.0.

What sets it apart is the work around the emails. Hypergen pairs outbound with Clay-based signal research and RevOps support in HubSpot or Salesforce, which helps teams whose CRM is part of the problem: replies get lost, duplicate contacts pile up, or nobody can say which campaign produced which deal.

The commitment is longer than most, with a six-month minimum.

Type of Service: Cold email campaigns with Clay-based signal research and CRM and RevOps work.

Pricing: From $6,500 a month with a six-month minimum, per its pricing page. One third-party source lists $7,500, so confirm the current figure.

Best For: Teams that need to fix their CRM at the same time as starting outbound.

Why It Stands Out: Outreach and CRM cleanup handled by one team, so pipeline reporting works from day one.

7. LeadHaste

LeadHaste is a small cold email shop, with 2 to 9 people on Clutch and a 2021 founding date. It runs managed cold email end to end, and per its website the client owns the sending domains and mailboxes rather than renting the agency's.

That ownership model is the main reason to look at it. If the engagement ends, the warmed infrastructure stays with you, which settles the first deliverability question further down before you ask it.

Per its website, LeadHaste takes on three to four new clients a month. It has no Clutch reviews yet, so ask for client references.

Type of Service: Managed cold email: infrastructure set up in the client's name, copy, daily deliverability monitoring and reply handling.

Pricing: $4,500 a month plus a $1,000 one-time setup fee, then month-to-month after month 3, per its website.

Best For: Teams that want to own their domains and mailboxes, whatever happens to the agency relationship.

Why It Stands Out: You keep the sending infrastructure, which most agencies on this list don't offer by default.

8. Cleverly

Cleverly is a Los Angeles agency founded in 2018 and best known for LinkedIn outreach, with cold email and calling offered alongside. It shows up in more cold email roundups than almost any other agency and is cited in Google's AI Overview for the search.

Its ratings are more mixed than its visibility suggests: 4.3 across 85 Clutch reviews and 3.8 on G2, against a strong 4.5 across more than 1,100 Trustpilot reviews. Read a handful of recent reviews on each platform before signing.

Cold email is a secondary service here, and its cold email pricing is no longer public.

Type of Service: LinkedIn-led outreach, with cold email and calling alongside.

Pricing: LinkedIn outreach from $397 to $997 a month, per its FAQ. Cold email pricing isn't published; the figure was removed from its homepage in 2026.

Best For: Small budgets and buyers who are active on LinkedIn.

Why It Stands Out: The lowest entry price on this list.

9. Growth Engine X

Growth Engine X does one thing: cold email, at volume. A Smartlead case study described the agency sending around 1.5 million cold emails a month at the time, and Clay's partner directory lists it at its Elite Studio tier.

The volume-first approach suits companies with a large addressable market, where testing many angles quickly matters more than hand-polishing each message. Teams selling to a few hundred accounts will get more from a smaller, more targeted program.

Type of Service: High-volume cold email only.

Pricing: Not published. New clients can start with a free test campaign, per its website.

Best For: Companies with a large addressable market that are comfortable with high-volume testing.

Why It Stands Out: A cold-email-only specialist that lets you test before you pay.

What does a cold email agency do?

A cold email agency runs your outbound program end to end, from deciding who to email to handing qualified replies to your sales team. Most of the work happens before the first message goes out, which is why two agencies with similar copy can get very different results.

A typical engagement covers five stages:

1. The agency defines your ideal customer profile with you, then builds a list of companies and contacts that match it, often using buying signals like hiring, funding or a new executive.
2. It buys secondary domains, sets up mailboxes and authentication records, and warms the inboxes for several weeks so they can send without landing in spam.
3. Writers draft the first email and follow-ups, then test subject lines, angles and offers against each other.
4. Campaigns go out at controlled daily volumes while the agency watches bounce rates, spam complaints and inbox placement.
5. Someone sorts replies, answers objections and books meetings on your calendar, or passes warm leads to your reps.

Agencies that also run LinkedIn or phone outreach layer those channels on top of the same list. The list itself is where most programs quietly succeed or fail, and that's where the next two sections pick up.

How much do cold email agencies cost?

Most B2B cold email agencies charge a monthly retainer somewhere between $2,500 and $6,000, according to Leadium's own pricing guide, which also puts pay-per-meeting deals at $300 to $700 per qualified meeting. The agencies in this roundup that publish a price run from $397/month for LinkedIn-only outreach to $6,500/month for cold email paired with RevOps work.

Published prices are the exception. A LeadButton review of 2026 roundups found that only six of the 15 agencies those lists named showed a price on their own site.

Retainer, pay-per-meeting and hybrid models

A flat retainer is the most common model. You pay the same amount each month, and the agency carries the cost of its team and tools. It's predictable, but you pay whether or not meetings arrive.

Pay-per-meeting shifts the risk to the agency, which sounds better than it often is. Agencies on this model have every reason to book meetings that technically count and rarely convert, so the contract needs a tight definition of "qualified" (title, company size, attendance) before it's worth anything.

Hybrid deals mix a lower retainer with a bonus per meeting or per opportunity. They're harder to compare but can align incentives better than either extreme.

What's included and what costs extra

The headline price rarely covers everything. Before comparing quotes, ask whether each of these sits inside the retainer or on top of it:

• Sending domains and mailbox licenses
• Sending and warmup software
• Contact data and verification
• One-time setup or onboarding fees (LeadHaste, for example, charges $1,000 at setup)
• Extra channels like LinkedIn or calling

Why four-week billing changes the annual cost

Some agencies bill per four-week cycle instead of per calendar month. A year holds 13 of those cycles, so a $10,000 cycle price becomes $130,000 a year, not the $120,000 you'd get by multiplying by 12. That extra cycle is worth knowing about before your finance team finds it.

How to work out your cost per meeting

Divide the total monthly cost, including extras, by the number of qualified meetings that actually took place. Suppose an agency charges $5,000 a month and your reps hold 10 qualified meetings from it: that's $500 per meeting. Compare that figure with your average deal size and close rate, and you'll know quickly whether the program pays for itself.

7 deliverability questions to ask before you sign

Deliverability decides whether any of an agency's copy gets read, and it's the area where sales pitches are vaguest. These seven questions turn "we handle deliverability" into answers you can check.

1. Whose domains and mailboxes will you send from, and who keeps them when the contract ends?

Some agencies send from domains they own and take them back when you leave, so your warmed-up sending reputation leaves with them. Others register everything in your name. Neither is wrong, but you should know which you're paying for, and get it in writing.

2. How will you set up SPF, DKIM and DMARC?

These aren't optional extras any more. Since February 1, 2024, Google has required anyone sending more than 5,000 messages a day to Gmail accounts to authenticate with SPF and DKIM, publish a DMARC record, align the From domain and keep spam rates in Postmaster Tools under 0.3%. Microsoft followed for Outlook.com, Hotmail.com and Live.com, and from May 5, 2025 began routing non-compliant mail from high-volume senders to Junk. A good agency will explain its setup without being asked twice.

3. How long do you warm new inboxes, and how many emails does each one send per day?

New mailboxes need time to build a sending history. Ask how many weeks of warmup the agency plans before live sending, and what daily cap it sets per inbox once campaigns start. If the answer is "as many as needed," keep asking.

4. How do you verify contact data, and what bounce rate do you commit to?

Bounces are the fastest way to tell mailbox providers you don't know who you're emailing. Ask where the agency gets contacts, whether every address is verified before sending (including catch-all domains), and what hard bounce rate it holds itself to. Several agencies and data vendors use 2% as the ceiling. If you build or check lists yourself, Findymail verifies each address in real time as it finds it, catch-all domains included.

5. How do you monitor inbox placement and spam complaints?

You want specifics: Google Postmaster Tools, seed tests, the spam-rate threshold that pauses a campaign, and how often you'll see those numbers. An agency that only reports opens and replies is flying without instruments.

6. What happens when a domain gets flagged?

Ask about backup domains, rotation and the rule for pausing a sender. Flagged domains happen to careful agencies too; the difference is whether there's a plan ready before it does.

7. How do you handle opt-outs and compliance?

In the US, CAN-SPAM requires a working opt-out, honoring it within 10 business days, a valid postal address and honest subject lines. Prospects in the EU and UK bring GDPR and UK GDPR into play. Ask how the agency logs opt-outs and keeps them out of every future campaign, including ones on other domains.

Cold email agency vs in-house SDRs vs cold email software

An agency is one of three ways to run outbound, and it isn't always the right one. The choice mostly comes down to how fast you need results and how much of the process you want to own.

Many companies end up mixing the three. They hire an agency to prove a market works, then bring the winning playbook in-house, or they keep software for small, targeted campaigns while an agency runs volume.

Whichever route you pick, the targeting problem stays yours. An agency can't fix a vague customer profile, and software just sends the vague version faster. Teams running outbound themselves can use Intellimatch to describe their ideal customer in plain English and get back matching companies with verified contacts.

Red flags when choosing a cold email agency

Most bad agency experiences were visible on the first call. Watch for these:

• A guaranteed number of meetings with no written definition of what counts as qualified
• Vague answers about whose domains you'll send from
• Reports that show opens and replies but never bounce or spam rates
• A six- or twelve-month lock-in with no pilot or exit clause
• A burst of five-star reviews posted within a day or two of each other
• No client references in your industry, or none they'll let you call
• "Unlimited" sending volume, which usually means unlimited risk to your domains"

One flag isn't always a dealbreaker. A newer agency may have thin reviews but excellent answers to the deliverability questions above. Three or four flags together, though, and the sales pitch is probably the best work you'll see from them.

Which cold email agency is right for your team?

Start with your channel mix and budget, then narrow by market.

Final thoughts

The best cold email agency for your team is the one whose channels, terms and market match yours, and whose answers to the deliverability questions hold up when you push on them. Shortlist two or three from the table, ask all seven questions on the first call, and compare the cost per meeting rather than the monthly headline.

And keep the list in mind. Every agency here is working from contact data, and the cleaner that data is, the less any of them has to fight the spam folder. Keeping your own verified lists in a tool like Findymail also means that switching agencies, or bringing outbound in-house, doesn't start from zero.

FAQ

Is cold emailing illegal in the US?

No. CAN-SPAM allows commercial email to people who haven't opted in, as long as you include a working opt-out, honor it within 10 business days, list a valid postal address and avoid misleading headers or subject lines. Rules differ for prospects in the EU and UK, where GDPR applies.

Do cold emails still work in 2027?

Yes, for teams that target tightly and send to verified addresses. Gmail and Microsoft's sender rules have made careless volume much riskier, so results depend more on list quality and setup than they did a few years ago.

Which cold email agency is the best?

It depends on your channels, budget and market. Belkins has the deepest review record, LeadHaste lets you keep the sending infrastructure, and Reachly has the strongest focus on signal-based targeting, with every campaign built in Clay around buying signals such as new hires, funding and headcount growth.

How much does a cold email agency cost per month?

Most retainers fall between $2,500 and $6,000 a month, and pay-per-meeting deals run about $300 to $700 per qualified meeting, according to Leadium's pricing guide. Check whether domains, data and setup fees are included.

How do I find a reliable cold email agency?

Check Clutch for review counts and dates, not just star ratings. Then ask about domain ownership, authentication, bounce rates and opt-out handling, and request references from clients in your industry.

What's the best cold email agency for startups?

Startups usually benefit from short commitments. LeadHaste goes month-to-month after its first three months, Growth Engine X offers a free test campaign, and Cleverly has the lowest entry price for LinkedIn-led outreach.

Valentin

Valentin Wallyn is the founder and CEO of Findymail, a SaaS platform he launched to help B2B teams discover accurate email and contact data and automate data enrichment at scale. With an IT background, Valentin combines a technical mindset with hands-on experience in outreach and growth. His work centers on improving data quality and prospecting efficiency, drawing on years of entrepreneurial experience and a deep understanding of what makes outreach campaigns succeed.