Cold email is still one of the cheapest ways to start conversations with B2B buyers, but running it well has become a specialist job. Mailbox providers have tightened bulk sender rules, data decays fast, and generic sequences get ignored or flagged. A cold email agency takes the whole program off your hands: targeting and list building, sending infrastructure, copy, sequencing, reply handling and, usually, booking meetings onto your reps’ calendars.
This list focuses on agencies that run cold email campaigns end to end. If your main problem is inbox placement on campaigns you already run, see our separate list of cold email deliverability agencies. If you want human SDRs working phones and LinkedIn as well as email, our guide to outsourced SDR companies is the better starting point.
The agencies below range from large outbound firms with in-house SDR teams to lean, infrastructure-heavy shops that send millions of emails a month on behalf of clients. Pricing models vary as much as the services: flat retainers, pay per lead, retainers plus a commission per held meeting, and setup fees for domains and inboxes.
To rank them, we checked each agency’s own website and public profiles for what it actually delivers, how it handles sending infrastructure, how transparent it is about pricing and terms, and what results it publishes. We favored agencies that explain who owns the domains and data, that offer short or month-to-month terms, and that publish named case studies. No agency paid for placement.
Cold Email Agencies At A Glance
Company
Headquarters
Best For
Pricing Model
Belkins
Denver, Colorado
Mid-market B2B teams wanting a full outbound team
Custom quote
SalesHive
Remote (US-based team)
Predictable flat-fee outbound with US SDRs
Flat monthly fee, month-to-month or annual
Cleverly
Los Angeles, California
SMBs testing cold email without a contract
Monthly retainer or pay per lead
Hypergen
Sofia, Bulgaria
Cold email paired with HubSpot and RevOps work
Contact volume packages
Sopro
Brighton, UK and Miami Beach, Florida
UK, European and US prospecting at scale
Quote based
Leadium
Las Vegas, Nevada
Venture-backed teams needing email plus calling
Monthly budget tiers
SalesCaptain
London, UK
Clay powered, signal-based email campaigns
Custom, one-month minimum
Beanstalk Consulting
Not disclosed
High-volume sending on dedicated infrastructure
Custom, 90-day proof of concept
LeadHaste
Not disclosed
Teams that want to own the infrastructure
4,500 USD per month plus setup
CIENCE
Denver, Colorado
Multichannel programs with email as one channel
Monthly fee plus per-meeting commission
Best Cold Email Agencies To Hire In 2027
1. Belkins — Full-Cycle Cold Email Outreach For 1,000+ B2B Clients Since 2017
Belkins has run outbound lead generation for B2B companies since 2017 and lists Denver, Colorado, as its headquarters on Clutch. It says it has worked with more than 1,000 clients across 50+ industries, and it holds a 4.9 rating from about 230 Clutch reviews. It is also a HubSpot Partner and a Google Partner.
Cold email outreach is one of its core services, staffed by a team that includes account managers, SDRs, lead researchers, copywriters and a dedicated email specialist who configures domains, warms mailboxes and monitors sender scores. Belkins also sells deliverability consulting on its own, which is useful if you want to keep some sending in-house later. Its published case studies include 330 appointments in 15 months and 320+ appointments in 12 months for individual clients.
Pricing is quote based. Belkins positions its program as a fraction of the cost of an in-house team, and it targets 100 to 400+ qualified appointments per year depending on the engagement.
Best for: Mid-market B2B companies that want a complete, staffed cold email program with deliverability expertise built in.
2. SalesHive — Flat-Fee Email Outreach Run By A US-Based SDR Team
SalesHive was founded in 2016 as a two-person startup and operates as a remote-first company. It reports more than 1,500 client accounts launched and over 106,000 qualified meetings booked since 2016. Its core SDR team is 100% US-based, with an optional offshore calling team for clients who want lower-cost phone coverage.
Email outreach is offered as a managed service from strategy through replies. SalesHive has built its own AI platform around it, including AI personalization tools, an AI Email Responder that sorts and answers replies, and a Smart Inbox for AI-assisted responses. Each client gets a dedicated strategist, and an SDR manager runs coaching for the team.
The pricing model is a single flat monthly fee covering the SDR team, strategist, platform, data and tools, with no setup fee and the choice of month-to-month or annual terms. Clients do not pay until they approve the campaign launch.
Best for: Companies that want predictable monthly costs and US-based reps handling email replies and follow-up.
3. Cleverly — Month-To-Month Done-For-You Cold Email With Pay-Per-Lead Option
Cleverly is based in Los Angeles and is well known for LinkedIn outreach, but it also runs a dedicated done-for-you cold email service. The agency builds prospect lists, writes personalized emails, runs the outreach, A/B tests messaging and notifies clients when meeting-ready leads arrive.
The commercial terms are the main draw for smaller companies. Engagements are month-to-month with no contract, and there are two plans: a Growth plan on a flat monthly retainer and a Scale plan priced per lead. Every client gets a dedicated account manager, weekly reporting and monthly strategy calls. Published case studies include PlantSwitch at 330 meetings in 12 months and Equity Front Capital at 122 meetings in 10 months.
Cleverly’s own case studies describe sending infrastructure built on Outlook accounts with dedicated IPs and multi-source contact verification. Because it runs LinkedIn programs too, it is easy to add a second channel later without changing vendors.
Best for: Startups and SMBs that want to test cold email without a long commitment, or prefer paying per lead.
4. Hypergen — Cold Email Infrastructure Combined With HubSpot And RevOps Consulting
Hypergen was founded in 2019, and its Clutch profile lists Sofia, Bulgaria, as its base. The agency combines cold email lead generation with the systems around it: sending infrastructure and deliverability (domains, inboxes, warm-up and SPF, DKIM and DMARC monitoring), Clay powered list building, HubSpot and CRM consulting, and sales automation.
It says it has helped more than 120 clients book meetings and close deals, and it publishes named case studies with revenue figures. Examples include Dingus and Zazzy, which Hypergen reports generated 4.5 million USD over 18 months, Gray Falkon at 900,000+ USD in revenue, and Prezzee at 270,000+ USD. Its client industries include agencies, financial services, SaaS, manufacturing, insurance and M&A advisory.
Clients buy contact-volume packages, and Hypergen offers free GTM and HubSpot audits before an engagement. The RevOps angle is the differentiator: leads land in a CRM that is set up to route and report on them.
Best for: HubSpot users who want cold email and the CRM workflows behind it handled by one team.
5. Sopro — Managed Prospecting Across The UK, Europe And US With 3,000+ Clients
Sopro was founded in 2015. Its Clutch profile lists Brighton and Hove, England, as headquarters, and its US entity is in Miami Beach, Florida. It runs fully managed, multichannel prospecting with email at the center, then hands sales enquiries to the client’s own team.
Sopro publishes unusually detailed volume stats on its site: more than 3,000 clients, over 22,000 campaigns, more than 91 million outreach messages sent and over 630,000 conversations started. It integrates with HubSpot, Pipedrive, Salesforce and Zoho, and it maintains a GDPR and PECR compliance section, which matters for UK and EU outreach.
Sopro serves SMEs as well as enterprises across SaaS, staffing, financial services, cybersecurity and telecoms. Its scale means repeatable processes, though very niche or highly technical audiences may need more custom copy than a volume model delivers by default.
Best for: SMEs and international firms prospecting into the UK and Europe that need GDPR-aware cold email at volume.
6. Leadium — Omnichannel Outbound With Deliverability And Tech Implementation
Leadium is headquartered in Las Vegas, Nevada, and led by CEO Kevin Warner. It runs outbound appointment setting across email, cold calling, LinkedIn, gifting and events, and it sells lead research, data sourcing and inbound lead qualification alongside it.
For cold email specifically, Leadium offers deliverability and tech implementation as a service, so clients get help with the sending stack as well as the campaigns. Its SDRs are sourced, trained and managed by Leadium. Named clients on its site include Freshworks, SharpSpring and Aaptiv, and the company says it has created more than 1 billion USD in opportunities for clients.
Budgets on its contact form start at 2,500 USD and run above 10,000 USD, which gives a sense of the range. Leadium also offers top-of-funnel consulting for teams that want to rebuild their outbound strategy before scaling volume.
Best for: Growth-stage and venture-backed companies that want cold email as part of a coordinated email, phone and LinkedIn program.
7. SalesCaptain — Signal-Based Cold Email Built On Clay And lemlist
SalesCaptain is based in London and works with clients across the US, Canada, the UK, Europe and Asia. It runs multichannel cold email and LinkedIn campaigns, with a strong emphasis on intent signals, inbound-led outbound and CRM enrichment built in Clay. It appears in Clay’s partner directory and is listed as an expert by lemlist and Salesforge.
According to its Clay partner profile, SalesCaptain sends about 1.2 million emails per month for clients, and it says more than 60 organizations have worked with it. Its published results include a case study with 120+ booked meetings and 1.5 million USD in new revenue over 12 months, and a B2B SaaS campaign with a 45% positive reply rate.
Engagements have a one-month minimum, and the agency also offers cold email training for teams that want to bring the work in-house. If Clay workflows are a priority, compare it with our list of Clay and GTM engineering agencies.
Best for: B2B SaaS teams that want highly targeted, signal-triggered email rather than broad volume.
8. Beanstalk Consulting — High-Volume Cold Email Powered By Its Own ScaledMail Infrastructure
Beanstalk Consulting is led by founder and CEO Dean Fiacco, who also runs ScaledMail, the email infrastructure platform that powers Beanstalk’s sending. That combination gives the agency unusual control over domains and inboxes: it reports 230,000+ inboxes under management and more than 20 million emails sent per month.
Campaigns run on tiered, enriched lists with angle-tested copy that a human writes and approves before sending, from dedicated and warmed domains. Beanstalk says it has served 150+ clients across 2,500+ campaigns, and it lists other plays it can add later, including LinkedIn outreach, cold calling, paid ads, CRM reactivation and intent signals.
Cold email is usually the starting point as a 90-day proof of concept. Beanstalk also offers a guarantee: if a client is not live by day 45, the second invoice is delayed until it is.
Best for: Companies with large addressable markets that need serious sending capacity and a structured test period.
9. LeadHaste — Client-Owned Cold Email Infrastructure With A Meetings Guarantee
LeadHaste has run outbound programs since 2023 and is led by co-founders Dimitar Petkov and Christian Sørensen. Its pitch is ownership: domains, mailboxes, data and sender reputation are registered in the client’s name, so if you leave, the assets leave with you. That is a meaningful difference from agencies that run campaigns on their own domains.
The team is built around GTM engineers who handle scraping, enrichment, lead scoring, sending infrastructure and message testing. It reports 50+ B2B clients and 400+ campaigns, with case studies such as HelpMatch at 120 meetings a month and Aviloo at 1.4 million USD in pipeline across 30+ markets.
LeadHaste is one of the few agencies that publishes its price: 4,500 USD per month plus a 1,000 USD setup fee, with a three-month initial term and month-to-month after that. Its meetings guarantee pauses payment if it misses the agreed meeting floor. A one-time build and handoff option suits teams that want to run the system themselves.
Best for: Companies that want transparent pricing and full ownership of their cold email stack.
10. CIENCE — Cold Email Inside A Multichannel SDR Program For 2,500+ Clients
CIENCE was founded in 2015 and is headquartered in Denver, Colorado, according to its Clutch profile. It says it has served more than 2,500 B2B clients and has booked meetings for over 10 years. Cold email is one of several outbound services, alongside cold calling, appointment setting, inbound SDR teams, demand generation and B2B contact data.
Because CIENCE also sells data, it can build target lists from its own database and run them through email and phone in a single program. It publishes 115+ case studies; examples include SendBird at 227 appointments in four months and Mandolin at 110 qualified meetings in six months. Pricing is a fixed monthly fee plus a commission for each held meeting, on month-to-month terms.
It ranks lower here only because email is one channel in a broader program rather than its sole focus. Reviews on Clutch are more mixed than for some smaller agencies, so check references in your industry.
Best for: Teams that want cold email combined with calling and data under one contract.
How To Choose A Cold Email Agency
Who Owns The Domains, Inboxes And Data?
Ask this first. Some agencies send from their own infrastructure and keep it when you leave, which means you start from zero if you switch vendors. Others register everything in your name. Neither is wrong, but you should know which you are buying and whether lead lists and reply history transfer at the end of the contract.
How Does The Agency Protect Deliverability?
A credible agency should explain its warm-up process, sending limits per inbox, authentication setup (SPF, DKIM and DMARC), list verification and how it monitors bounce and spam rates. Never let an agency send cold email from your primary company domain. Our article on B2B email deliverability challenges covers the basics you should check.
What Counts As A Result?
Define a qualified meeting in writing before launch: title, company size, region and buying situation. Agree on whether you pay for meetings booked or meetings held, and how no-shows are handled. Reply rates and opens are diagnostic metrics, not outcomes.
Who Writes And Approves The Copy?
Personalization quality is where agencies differ most. Ask to see sample sequences for a company like yours, how many angles they test, and whether you approve copy before it goes out. Agencies that write once and blast for months tend to burn through a market quickly.
How Long Is The Commitment?
Infrastructure needs a few weeks to warm up, so the first month rarely shows full results. A three-month test is reasonable; a twelve-month lock-in before any proof is not. Look for month-to-month terms after an initial period, or a guarantee that pauses fees if targets are missed.
Frequently Asked Questions
How Much Does A Cold Email Agency Cost In 2027?
Few agencies publish prices. Among those that do, LeadHaste charges 4,500 USD per month plus setup, and Leadium’s contact form starts budgets at 2,500 USD. Full-service programs with dedicated SDRs typically cost more than email-only campaigns, and pay-per-lead models trade a lower base for a higher cost per meeting.
Is Cold Email Legal?
B2B cold email is legal in the US under CAN-SPAM if you identify yourself, avoid deceptive subject lines, include a physical address and honor opt-outs. The UK and EU impose stricter rules under GDPR and PECR, so agencies working those markets should document a lawful basis for processing and keep suppression lists.
How Long Before A Cold Email Campaign Books Meetings?
Most agencies need two to six weeks for onboarding, list building, domain setup and warm-up before full sending. First meetings often arrive in the first month of live sending, with results stabilizing once copy and targeting have been tested.
Should I Hire An Agency Or Build Cold Email In-House?
An agency is faster to launch and brings tested infrastructure. In-house gives you more control and builds knowledge inside the company. Many teams start with an agency, then bring it in-house once the playbook works, using tools from our list of B2B prospecting tools.
What Is The Difference Between A Cold Email Agency And A Deliverability Agency?
A cold email agency owns the whole campaign: targeting, lists, copy, sending, replies and meetings. A deliverability specialist focuses on getting your existing emails into the inbox through authentication, infrastructure and reputation fixes. Several agencies on this list do both, but if your campaigns already convert and only inbox placement is failing, a deliverability specialist is usually the cheaper fix.
Conclusion
The best cold email agencies in 2027 are transparent about infrastructure, clear about what counts as a meeting, and willing to prove results over a short initial term. Belkins and SalesHive suit companies that want a staffed outbound team, Cleverly and LeadHaste stand out on terms and pricing, Hypergen and SalesCaptain bring systems and signal-based targeting, and Sopro is a strong pick for UK and European prospecting.
Shortlist two or three agencies, ask each the ownership and deliverability questions above, and compare their sample copy for your market before you sign. If you want email to feed a broader pipeline engine, our roundup of lead generation companies covers the wider field.
