Building an in-house cold email operation is harder than it looks. You need dedicated domains, proper authentication (DKIM, DMARC, SPF), warm-up processes, curated lead lists, personalized copy, and someone to manage replies. Most B2B companies don't have the bandwidth to do this well.

Cold email outreach agencies handle all of it. They bring the infrastructure, the expertise, and the processes. You bring your ideal customer profile.

Here are the best cold email outreach agencies worth considering in 2026.

1. OutreachBloom

Best for: B2B companies that want a fully managed cold email service without the complexity of multi-channel

OutreachBloom is a done-for-you cold email agency that handles your entire outbound operation from start to finish. They focus exclusively on cold email, which means faster setup and less coordination overhead compared to agencies that spread across multiple channels.

Their process starts with a kickoff call to define your ICP. From there, they build targeted prospect lists using premium B2B databases, set up fresh sending domains with proper DKIM, DMARC, and SPF authentication, and warm them for two weeks before launching personalized outreach. The team crafts email copy, manages sending at scale, filters replies, and forwards qualified leads directly to you.

What sets OutreachBloom apart is their singular focus on deliverability and personalization. By concentrating on email-only outreach rather than trying to be everything to everyone, they've built deep expertise in what makes cold emails land in inboxes and get replies.

Best for: B2B startups and growing companies that want consistent pipeline without hiring SDRs Services: Domain setup, email warmup, lead list building, copywriting, campaign management, reply handling Pros: True done-for-you service, strong deliverability focus, handles everything from domains to replies, no long-term contracts required Cons: Email-only (no LinkedIn or phone), custom pricing requires a discovery call

2. Belkins

Best for: Companies that need omnichannel outreach at scale

Belkins is one of the largest B2B lead generation agencies, with 800+ clients and over 50,000 email variations tested. They combine cold email with LinkedIn outreach, cold calling, and dedicated SDR services into coordinated campaigns.

Belkins assigns a dedicated team to each client, including researchers, copywriters, and SDRs. They handle lead research, email deliverability, appointment setting, and even offer LinkedIn influencer programs. Their scale means they've accumulated significant data on what works across industries.

Best for: Mid-market and enterprise companies wanting multi-channel outbound Services: Cold email, LinkedIn outreach, appointment setting, lead research, SDR teams Pricing: $5,000–$15,000/month depending on scope Pros: Proven track record, massive scale, omnichannel approach, dedicated teams Cons: Higher price point, may be overkill for early-stage startups, longer onboarding

3. SalesHive

Best for: Companies that want US-based SDRs with flexible contracts

SalesHive combines cold email outreach with US-based SDR teams and a proprietary AI-powered sales platform. They offer month-to-month contracts, which is rare in this space and makes them accessible for companies that want to test agency outreach without a long commitment.

Their platform tracks campaign performance in real time, and their SDRs handle email, phone, and LinkedIn outreach. SalesHive emphasizes transparency in pricing and reporting, so you always know what you're paying for and what results you're getting.

Best for: Companies wanting flexible, no-commitment outbound with US-based reps Services: Cold email, cold calling, LinkedIn outreach, AI sales platform, dedicated SDRs Pricing: Starts around $5,000/month Pros: Month-to-month contracts, US-based SDRs, transparent pricing, proprietary AI platform Cons: Higher cost than email-only agencies, less specialized in email deliverability

4. Cleverly

Best for: LinkedIn-first outreach with cold email as a supporting channel

Cleverly built their reputation on LinkedIn outreach. They've analyzed thousands of LinkedIn campaigns to understand what messaging works for connection requests and follow-ups. More recently, they've expanded into cold email, creating a multi-channel approach that starts with LinkedIn and adds email follow-up.

Their pay-per-lead pricing model makes costs more predictable. Instead of a flat monthly retainer, you pay based on qualified leads delivered. For companies where LinkedIn is the primary channel and email is supplementary, Cleverly's LinkedIn expertise is hard to match.

Best for: B2B companies where LinkedIn is the primary prospecting channel Services: LinkedIn outreach, cold email, pay-per-lead, content creation Pricing: Pay-per-lead model available, retainers from $1,000/month Pros: Deep LinkedIn expertise, pay-per-lead option, data-driven approach, lower entry price Cons: Cold email is secondary to LinkedIn, less email deliverability depth

5. Pearl Lemon Leads

Best for: UK and US-based companies wanting a broad B2B lead generation partner

Pearl Lemon Leads is a B2B lead generation agency with offices in London and New York. They offer cold email outreach alongside cold calling, LinkedIn prospecting, appointment setting, and content marketing. Their in-house team of copywriters ensures that outreach emails are personalized and optimized.

Pearl Lemon stands out for their breadth of services. If you need lead generation across multiple channels and geographies (UK, US, and beyond), they can coordinate campaigns across time zones and markets. They also offer SEO and content marketing services, which can complement outbound efforts.

Best for: Companies targeting UK and US markets with multi-channel outbound Services: Cold email, cold calling, LinkedIn outreach, appointment setting, SEO, content marketing Pricing: Custom quotes based on scope Pros: Multi-geography coverage, broad service offering, experienced copywriters, established reputation Cons: Less specialized than email-only agencies, custom pricing can be opaque

6. LevelUp Leads

Best for: Tech and SaaS companies with complex ICPs

LevelUp Leads specializes in B2B lead generation for technology companies. They combine cold email with LinkedIn and phone outreach, but their differentiator is their focus on technical ICPs. If you're selling to CTOs, engineering managers, or DevOps teams, LevelUp understands how to position your messaging for technical buyers.

Their process includes deep ICP research, account-based targeting, and technical copywriting that resonates with developer and engineering audiences. For SaaS companies selling technical products, this specialization matters.

Best for: SaaS and tech companies selling to technical buyers Services: Cold email, LinkedIn outreach, phone outreach, ICP research, account-based targeting Pricing: Starts around $3,000/month Pros: Tech industry focus, understands technical buyers, account-based approach Cons: Niche focus may not suit non-tech companies, smaller team than larger agencies

7. ColdIQ

Best for: Data-driven cold email with advanced personalization

ColdIQ takes a data-heavy approach to cold email outreach. They use intent data, technographic data, and behavioral signals to identify prospects who are actively in-market for solutions like yours. This means higher reply rates because you're reaching people at the right time.

Their campaigns use advanced personalization beyond just first name and company name. They incorporate recent company events, tech stack data, and hiring signals into email copy. For companies that want cold email backed by deep data, ColdIQ delivers.

Best for: Companies that want intent-driven, highly personalized cold email Services: Cold email, intent data targeting, lead research, advanced personalization Pricing: Custom quotes Pros: Data-driven targeting, advanced personalization, intent signals, higher reply rates Cons: Premium pricing, more complex onboarding, data-dependent approach

How to Choose the Right Cold Email Agency

The right agency depends on your situation:

Want email-only, fully managed? OutreachBloom keeps things focused and handles everything from domains to replies.
Need omnichannel at scale? Belkins or SalesHive offer email + phone + LinkedIn with dedicated SDR teams.
LinkedIn is your primary channel? Cleverly has the deepest LinkedIn expertise and adds email as a supplement.
Selling to technical buyers? LevelUp Leads understands how to reach CTOs and engineering teams.
Want data-driven targeting? ColdIQ uses intent signals to reach prospects at the right time.

Before committing, ask every agency:

How do you handle deliverability? Domain setup, authentication, warmup processes matter.
What's your lead sourcing process? Garbage in, garbage out. Quality lists drive results.
How do you personalize at scale? Generic templates don't work anymore.
What does reporting look like? You need visibility into open rates, reply rates, and qualified meetings.
What are the contract terms? Month-to-month is ideal. Long lock-ins are a red flag.

Cold email outreach still works in 2026. The difference between success and failure is execution. The right agency brings the infrastructure, expertise, and processes to make it work consistently.