Best Cold Email Agencies (2026)
Cold email is harder than it looks.
You need: domain infrastructure that doesn't get blacklisted, inbox warmup that actually works, copy that gets replies, deliverability monitoring 24/7, and someone handling responses while you close deals.
Most in-house teams underestimate the infrastructure complexity. One wrong move and your domain reputation tanks. Agencies that specialize in this handle the messy parts so you don't have to.
Here's who does it best in 2026.
1. BuzzLead
Website: buzzlead.io
Best for: Mid-market B2B companies wanting systematic cold email at scale
Pricing: ~$5,000/month
BuzzLead operates what they call a "referral replacement system" — replacing the inconsistent trickle of referral-based leads with predictable cold email pipeline.
What sets them apart:
20,000+ managed email accounts across clients
39-55 subdomain infrastructure per client
Focus on deliverability as their core moat
4-month pilot with no long-term lock-in until results proven
Real results:
ProductEVO: $90K profit, 142 meetings in 10 months
Life360: $120K MRR added in 42 days
DiamondLinks: $100K pipeline in 5 weeks
Who it's for: SaaS companies and B2B service businesses ($2-10M revenue) who've hit the ceiling with referrals and want a predictable meeting flow.
2. OutreachBloom
Website: outreachbloom.com
Best for: Businesses wanting 100% done-for-you cold email without learning curves
Pricing: Custom
OutreachBloom is a B2B cold email lead generation agency that handles everything from list building to messaging to reply management. They've been in the game since 2010 and have served over 1,000 businesses.
What sets them apart:
Full-service model — they handle replies and introductions for you
2-week ramp to first sends (infrastructure warmup included)
AI-assisted research for personalization at scale
Extensive testing and optimization baked in
Who it's for: Business owners and executives who want outbound running without managing it themselves. Good for companies that want the burden completely removed.
3. Belkins
Website: belkins.io
Best for: Companies wanting appointment setting at scale
Pricing: $10,000-20,000+/month
Belkins is one of the larger B2B appointment setting agencies. They combine cold email with LinkedIn outreach and have a large team of SDRs.
What sets them apart:
Multi-channel approach (email + LinkedIn)
Large operation with significant resources
Strong focus on appointment setting metrics
Who it's for: Companies with $10K+/month budget who want a full SDR team replacement.
4. CIENCE
Website: cience.com
Best for: Enterprise companies needing multi-channel outbound
Pricing: $8,000-15,000+/month
CIENCE offers full-service outbound including SDR teams, research services, and multi-channel campaigns (phone, email, LinkedIn, direct mail).
What sets them apart:
Research-first approach
Dedicated SDR teams
Multiple channel options
Who it's for: Larger companies that want multi-channel outbound managed by one agency.
5. SalesRoads
Website: salesroads.com
Best for: B2B companies wanting phone + email appointment setting
Pricing: $10,000+/month
SalesRoads focuses on appointment setting through a combination of cold calling and email outreach.
Who it's for: Companies that want phone outreach as part of their mix, not just email.
6. Martal Group
Website: martalgroup.com
Best for: Tech and SaaS companies wanting SDR outsourcing
Pricing: $8,000+/month
Martal Group offers outsourced SDR services with a tech-industry focus.
Who it's for: Tech companies wanting dedicated SDR resources without building in-house.
7. Cleverly
Website: cleverly.co
Best for: LinkedIn-first outreach with email support
Pricing: $1,000-5,000/month
Cleverly started as a LinkedIn outreach agency and has expanded to include cold email.
Who it's for: Companies whose ICP is highly active on LinkedIn.
8. LeadGenius
Website: leadgenius.com
Best for: Companies that need custom B2B data more than campaign execution
Pricing: $3,000-10,000+/month
LeadGenius specializes in custom B2B data using human researchers plus AI. They're more of a data company with some outreach services.
Who it's for: Companies that have outreach execution covered but need better data.
9. Apollo.io (Self-serve)
Website: apollo.io
Best for: Teams that want to run their own campaigns with solid data
Pricing: $49-119/user/month
Apollo isn't an agency — it's a platform. But for companies that want to DIY their cold email, it's a strong option.
Who it's for: Teams with cold email experience who want tools, not services.
10. Reply.io (Self-serve)
Website: reply.io
Best for: Teams wanting multi-channel sequence automation
Pricing: $60-90/user/month
Reply.io is another platform option for DIY cold outreach across email, LinkedIn, and calls.
Who it's for: Teams that want to build their own system with good tooling.
How to Choose
Go with a specialized cold email agency (BuzzLead, OutreachBloom) if:
Cold email is your primary outbound channel
Deliverability and inbox placement are priorities
You want proven results before long-term commitment
You don't have infrastructure expertise in-house
Go with a full-service agency (CIENCE, Belkins) if:
You want multi-channel (phone + email + LinkedIn)
You have budget for $10K+/month
You need SDR team replacement
Go DIY with platforms (Apollo, Reply) if:
You have cold email experience
You want to control everything yourself
You have time to manage campaigns
FAQ
How much should I expect to pay for a cold email agency?
Specialized cold email agencies typically run $4,000-6,000/month. Full-service outbound agencies with SDR teams are $8,000-20,000+/month. DIY platforms are $50-150/user/month.
How long until I see results?
Most agencies need 2-4 weeks for infrastructure warmup. Expect first qualified replies within the first month. Consistent meeting flow typically develops by month 2-3.
What results are realistic?
Well-run cold email campaigns generate 15-30 qualified meetings per month for most B2B companies. Cost per meeting typically ranges from $300-600 with a good agency.
Should I use an agency or build in-house?
Agencies make sense if: you don't have deliverability expertise, you want faster ramp, or you'd rather focus on closing than building infrastructure. In-house makes sense if you have experience and want full control.
What questions should I ask an agency?
How many inboxes/domains do you manage per client? What's your deliverability monitoring process? Can I see specific client results (not just testimonials)? What's the pilot period before long-term commitment? Who handles reply management?