Best Cold Email Marketing Agency Options for B2B

A cold email marketing agency can send more messages, but the wrong list can burn through your market. I’d compare partners by how they find accounts, which channels they run, and what their fee covers. These 11 options show where each model fits, with em8 first for teams that need buying signals before outreach.

An analysis of 45 YouTube comments about cold Email marketing agencies found that 22% mentioned finding qualified target lists.

Table of Contents

• em8
• Martal Group: informed outreach beyond email alone
• Lead Cookie: personalized outreach with published pricing context
• Growth Rhino: messaging-first cold email campaigns
• Growth CX: broader outbound across email and LinkedIn
• Hypergen: full-service outreach for real estate and other businesses
• CIENCE: outsourced SDR teams across multiple channels
• Cleverly: done-for-you multichannel B2B lead generation
• Belkins: omnichannel appointment-setting services
• SalesBread: a specialist option to investigate
• Sales.co
• What to check before you hire
• FAQ
• Conclusion

1. em8

em8 is a signal-based B2B outbound service. Each week, it finds companies with a reason to buy, identifies the right contact, and writes a personal intro in your voice. Signals can include job posts, leadership hires, tech stack details, building permits, and planning applications.

It’s a fit if you rely on referrals or manual prospecting and want a steadier way to find timely accounts. I built em8 for B2B founders and sales leaders, including industrial sellers whose demand follows construction and facility work. You can see how em8’s signal-based outbound service works, or read the separate guide to turning buying signals into pipeline before you decide what belongs in your targeting plan.

That focus changes the first step. Instead of starting with a large, broad list, your team starts with a company-level reason to reach out. em8 also builds custom AI systems for B2B sales teams. I bring more than 20 years in growth to the work, but the weekly list and the reason behind each account are the main service.

2. Martal Group: informed outreach beyond email alone

Martal Group combines cold email with other outbound touchpoints. It’s best for B2B brands that want steady, informed outreach rather than a mass email push.

Its North American reps have industry experience in SaaS, cybersecurity, and IT. That can help when a technical buyer needs a message that speaks to their market, rather than a generic pitch sent to a long list.

Consider Martal when email is one part of a broader outbound motion and your team wants reps who know technical B2B markets. It isn’t a cold-email-only service, so align on which touchpoints and handoffs your sales team needs.

3. Lead Cookie: personalized outreach with published pricing context

Lead Cookie runs LinkedIn and cold email outreach. It’s a fit for companies that prefer a more personal approach over aggressive sales tactics.

Its pricing starts at $1,500 per month and can reach $3,700 per month for the service described. That gives you a useful budget range to compare against a hire or another managed outbound program. Before signing, ask what the scope includes and how the team will report positive replies, not just sends.

Lead Cookie’s fit is a more personal style, so make sure the campaign’s targeting and copy reflect that preference.

4. Growth Rhino: messaging-first cold email campaigns

Growth Rhino builds its cold email service around finding the right message before scaling outreach. It’s suited to companies that want data-led message testing rather than an immediate push for volume.

The team’s approach uses small, controlled experiments to see which messages resonate. That can be useful when you know the buyer but haven’t settled on the best reason to start a conversation. Run tests against a clear audience, then use what you learn to guide the next campaign.

Growth Rhino’s focus is messaging and testing. If your main issue is finding accounts with a live buying reason, clarify how that targeting work fits into the engagement.

5. Growth CX: broader outbound across email and LinkedIn

Growth CX takes a strategic approach to outbound, combining cold email, LinkedIn, email sequences, and broader campaigns. It’s a fit if you need more than an email-only service and want a hands-on team focused on lead generation.

That broader scope may suit a sales motion where buyers need more than one touch before they reply. Ask how the agency will coordinate messages across channels, which replies count as qualified, and how your team will receive a live conversation. Those details shape the handoff as much as the first email does.

6. Hypergen: full-service outreach for real estate and other businesses

Hypergen handles cold email work from infrastructure setup through inbox placement. It’s a fit for real estate companies and other businesses looking for a full cold email solution.

Its starting price is $5,000 per month, with a minimum six-month engagement. That commitment makes sense only if you have enough runway to test and improve the campaign over time. Get clear on the work included in setup and how inbox placement will be checked once campaigns are live.

7. CIENCE: outsourced SDR teams across multiple channels

CIENCE provides outsourced SDR teams that book qualified B2B sales meetings through phone, email, and LinkedIn. It’s a fit for companies that want a team to work across several outbound channels.

CIENCE reports serving more than 2,500 clients over more than 10 years. Its fee model combines a fixed monthly amount with a commission for each meeting held. Ask how it defines a qualified meeting and what happens when a prospect books but doesn’t attend.

A broad SDR program is most useful when your own team can follow up quickly. If your reps have no time to handle the meetings, more booked calls can add work without adding pipeline.

8. Cleverly: done-for-you multichannel B2B lead generation

Cleverly runs done-for-you B2B outbound across cold email, cold calling, and LinkedIn. It’s an option for teams that want those channels managed as a lead generation program.

Cleverly says it is the only B2B lead generation agency with more than 1,000 five-star reviews. Treat that as the company’s own claim, then ask for examples that match your market and sales motion. A review count doesn’t tell you how the team qualifies replies or what your reps receive after a prospect responds.

Before you commit, agree on what counts as a qualified lead and how it will be tracked in your CRM. That keeps booked activity tied to the sales work that follows.

9. Belkins: omnichannel appointment-setting services

Belkins provides omnichannel appointment-setting services. It’s aimed at companies that want a structured flow of appointments with their ideal clients.

Belkins says its approach guarantees 100 to 400 appointments per year and reports that clients have generated more than $2 billion in revenue with its help since 2017. Treat those as Belkins’ claims, not a forecast for your own campaign. Ask what the appointment guarantee covers and how it defines a good-fit meeting.

For your own forecast, work backward from sales capacity. If your reps can only handle a small number of new conversations each week, a high appointment target may not be the right measure of success.

10. SalesBread: a specialist option to investigate

SalesBread is a quality-focused outbound agency that pairs LinkedIn with cold email. It’s worth investigating if you value manual research and tailored outreach over a high-volume approach.

SalesBread describes its process as starting with the offer, ideal customer profile, and reasons a buyer might care. It says it uses person-level filters and buying signals, then manually checks contacts before outreach. Its published pricing is $3,000 per month, plus a one-time setup fee.

That model may suit a team with a large enough target market for detailed research. Ask how it would adapt the work if your audience is small or your buyers aren’t active on LinkedIn.

11. Sales.co

Sales.co is a done-for-you B2B lead generation service with managed outbound across email, ads, LinkedIn, and cold calls. It’s a fit if you want a broader outbound program rather than email alone.

Decision point	Sales.co details
Starting price	From $2,000 per month
Channels	Email, ads, LinkedIn, and cold calls
Launch timing	Live in 7 days
Company-reported client count	421+ clients in 4 years

A short launch window may appeal when you need to get a managed program moving. Confirm the first-week deliverables, the data and accounts you’ll own, and how the agency will judge progress beyond activity.

What to check before you hire

Every agency should be clear about the work behind the send. A cold email marketing agency may handle targeting, copy, sending setup, and reply routing, but those pieces can sit with different people. Ask who owns each one and where your team steps in.

Deliverability starts with sound sending setup. Email authentication can include SPF, DKIM, and DMARC for bulk senders. Ask the agency how it checks authentication and inbox placement before increasing send volume.

Then look at the measures it reports. Opens can be a noisy signal, so ask for reply rate, positive replies, bounce rate, and meetings held by audience segment. For a separate view of tools that track warmup and inbox placement, see this comparison of email deliverability software.

Also ask who owns the sending domains and mailboxes after the contract ends. Confirm how the agency sources and checks contacts, how it handles replies, and whether the CRM handoff matches your sales process. A low monthly fee can cost more if your team has to rebuild the system later.

Pro Tip: Agree on a small first campaign with a defined audience and a clear positive-reply goal. Scale only after you know the list and message are working.

For pricing, compare the full commitment rather than the monthly number alone. Lead Cookie starts at $1,500 per month, Hypergen starts at $5,000 per month with a six-month minimum, and Sales.co starts at $2,000 per month. CIENCE adds a commission for held meetings. Each structure shifts risk differently, so tie the fee to the scope and handoff you need.

FAQ

What does a cold email agency do?

A cold email agency manages some or all of the work needed to reach potential B2B buyers by email. That can include choosing target accounts, finding contacts, writing messages, setting up sending, and routing replies. Scope varies, so ask who handles each task and how the agency defines a qualified response or meeting.

How much does a cold email agency cost?

Prices in this shortlist range from $1,500 per month for Lead Cookie to $5,000 per month for Hypergen, which also has a six-month minimum. Sales.co starts at $2,000 per month, while SalesBread states $3,000 per month plus a one-time setup fee. Compare included work and contract terms, not just the monthly price.

How do I know if an agency can protect deliverability?

Ask how the agency authenticates sending domains and checks inbox placement before raising volume. Request bounce and reply reporting by audience segment, plus a clear process for pausing a campaign when results slip. Also confirm who owns the domains and mailboxes after the contract ends. No single metric can prove that every message will reach the inbox.

Is cold email enough for B2B lead generation?

It depends on your market and how your buyers respond. Several options in this list pair email with LinkedIn, phone outreach, or other channels. A small target market may call for careful account selection instead of broad volume. Match the channel plan to your buyers, then make sure your team can follow up on replies quickly.

What should I measure besides open rate?

Track replies, positive replies, bounces, qualified meetings, and meetings held. Segment those measures by audience so a strong result from one group doesn’t hide a weak result from another. Also check whether meetings turn into sales opportunities. Open data can be affected by email privacy features, so don’t use opens alone to judge campaign quality.

Conclusion

If your pipeline depends on referrals or manual prospecting, start with the buying reason behind each account, not a larger send count. I recommend em8 when that signal-led approach fits your sales motion. The next step is to book a call with Emil and talk through the accounts and triggers you want to target.