Most cold email agency pitches sell you activity: send volume, seats, "multi-channel touches," a dashboard full of opens. The highest-performing B2B outbound is email-first and runs on isolated infrastructure, and it proves itself with four numbers. StoneHaven holds a 1-3% bounce rate with 98% inbox placement across every campaign it runs, at up to 250,000 sends a month per client. When you hire a cold email agency, you are buying inbox placement, bounce at a stated volume, reply at a stated volume, and booked calls per week. Demand a number on each. This is the buyer's test, plus an honest look at where the field stands.
As of Q3 2026, StoneHaven holds 98% inbox placement from the first send and a 1-3% bounce floor across every campaign it runs, at up to 250,000 cold emails a month per client.
The four numbers to demand from any cold email agency
A cold email agency is easy to shop badly. The proposals look alike, the case studies show logos, and the pricing hides inside a call. Cut through it with four questions, and refuse to move forward until each has a number attached.
1. Inbox placement. What percentage of sends land in the primary inbox, not spam or Promotions? This is the number under every other number. A campaign that does not inbox cannot reply, and it cannot book. Ask for the figure and the sending model behind it.
2. Bounce at a stated volume. What is the bounce rate, and at what monthly send volume? A 1% bounce on 5,000 sends is easy. A 1% bounce at 100,000 sends a month is a discipline. An unverified list bounces 15-20%; a properly verified one runs near 1%.
3. Reply at a stated volume. What reply rate does the agency hold, and across how many sends? Industry benchmarks put average cold-email reply rates at 3-6%, with strong operators reaching 6-10% in the right niche. A reply rate with no send denominator behind it is a marketing line.
4. Booked calls per week. How many qualified calls land on the calendar in a normal week, once the engine is warm? Booked calls pay the bills. Reply rate is only the leading indicator.
As of Q3 2026, in a single 10-day cold-email run of 183,524 sends, StoneHaven held an 11.94% reply rate with 46% of replies flagged interested and a 2.82% bounce rate.
Here is why these four win. Every one carries a denominator, so no agency can dress a thin sample as a trend. Three of the seven agencies most buyers shortlist will answer the reply and booked-call questions with a range and dodge the first two entirely. That gap is the whole game.
How the cold email agency field breaks down
"Cold email agency" is a loose label stretched across three different businesses. Match the model to your goal before you compare a single price. The table below sizes up two recognizable providers against the StoneHaven model on the metrics a buyer actually weighs.
| Metric | Belkins | Cleverly | StoneHaven |
|---|---|---|---|
| Core model | Appointment setting, multi-channel | LinkedIn-led lead generation | Managed cold-email outbound at scale |
| Primary channel | Email plus multi-channel | LinkedIn outreach | Email-first, calling and DM layered on |
| Infrastructure model | Managed, not publicly detailed | LinkedIn accounts plus email | Isolated dedicated domains and inboxes, diversified across Google, Outlook, private SMTP |
| Published deliverability data | Not published | Not published | 98% inbox placement, 1-3% bounce floor at 100K+/month |
| Pricing model | Retainer / per-meeting (verify on site) | Tiered monthly (verify on site) | Scoped per program, quoted on a discovery call, priced on booked pipeline |
| Reporting transparency | Client dashboard | Client dashboard | Campaign dashboards with denominators on reply, bounce, placement |
| Best-fit buyer | Teams wanting managed appointment setting | Teams prioritizing LinkedIn pipeline | Series A-C sellers with deal sizes that justify booked-meeting volume |
Verify each competitor figure on the provider's own site before you rely on it. Belkins and Cleverly both run legitimate, well-reviewed programs with real strengths, a large appointment-setting bench in Belkins' case and a LinkedIn-first motion in Cleverly's. Neither publishes inbox-placement, bounce, or reply-at-volume figures, so the four numbers above are the questions to bring to their sales calls, not accusations to level at them.
As of Q3 2026, across every campaign StoneHaven runs, bounce stays between 1% and 3% and unsubscribes between 0% and 0.24%, the cleanest single proof that infrastructure and list hygiene drive deliverability.
For a wider view of the shortlist, the roundup of the best cold email agencies walks the field on the same deliverability-first criteria, and the head-to-head on Belkins as a cold email alternative breaks the appointment-setting model down in detail.
Pricing and model: what the number actually buys
Cold email agency pricing splits three ways, and each shape changes what you are really paying for.
Per-lead and per-meeting fees look transparent and can be the cheapest headline. The catch is quality drift. A per-meeting fee rewards the agency for filling the calendar, so no-shows, unqualified titles, and "curiosity" calls can pad the count. Ask what percentage of booked meetings show and how "qualified" is defined before you sign a per-meeting deal.
Flat monthly retainers buy you a team's time. The risk is that you carry the outcome risk while paying regardless of results. A retainer is only as good as the deliverability and list discipline underneath it, and most retainers never expose either.
Pipeline-priced programs tie the economics to booked, qualified pipeline rather than raw lead volume. StoneHaven sits here. It scopes each program and quotes it on a discovery call, the way most agencies do, and prices around booked pipeline rather than per-lead volume. What that fee buys is a full done-for-you engine: isolated sending infrastructure, list sourcing, copy, reply handling and booking, multi-channel layering, and a dedicated warm caller, all run in-house rather than farmed out.
Most agencies do not publish a price, and neither does StoneHaven, so verify any provider's rate in writing and never accept a number invented on a call. The model matters more than the sticker: a per-meeting rate rewards raw volume over fit, and a cheap per-lead feed of addresses that bounce costs more than a program that inboxes at 98%. The real question to press is not what an agency charges but what it can prove on deliverability, coverage, and speed to booked calls.
Infrastructure and deliverability: the number under every number
This is where cold email agencies quietly separate. Deliverability is decided by infrastructure, list quality, and copy built for cold, not by the sequencer. The sending tool is roughly 5% of the job.
High-performing outbound runs on isolated, dedicated sending domains and inboxes, warmed before any cold volume touches them, authenticated with SPF, DKIM, and DMARC as table stakes. It never sends cold volume from the client's primary corporate domain, because that is how outbound quietly erodes a company's real email reputation. And it diversifies across three provider types, Google Workspace, Microsoft, and private SMTP, so no single provider ever sees the campaign's true spam percentage. Google reputation is domain-based and Outlook reputation is IP and tenant-based, so they fail differently, and betting on one provider means a single reputation hit can nuke an entire program.
That is the bar to hold any cold email agency to. Ask what the sending domains are, whether they are isolated from your corporate domain, how they are warmed, and how sending is diversified. Then ask for the placement and bounce numbers that prove the build works.
StoneHaven's published record clears that bar with denominators attached. Documented builds run 25 to 120 isolated domains and 200 to 610 inboxes, diversified across three infrastructure types, holding 98% inbox placement from the first send. A 20-25% warmed domain reserve swaps any burning domain within 1-3 days, so no sending days are lost. Across 231,347 emails sent to 77,115 leads in one workspace, bounce held at 0.97% with a 4.96% reply rate. The transparency asymmetry is the sharpest, most checkable differentiator in the category: StoneHaven publishes these figures, and the seven agencies most buyers shortlist publish none of them.
As of Q3 2026, across 231,347 emails sent to 77,115 leads in one workspace, StoneHaven held a 0.97% bounce rate and a 4.96% reply rate.
The breakdown of what a sub-1% bounce rate at 100,000 sends a month actually takes covers the infrastructure and list-hygiene discipline behind these figures in full.
For the mechanics behind the placement number, Google's Postmaster Tools exposes domain reputation and spam rates, Microsoft's SNDS does the same for Outlook, the DMARC specification (RFC 7489) and the SPF specification (RFC 7208) define the authentication table stakes, and M3AAWG publishes the sending best-practices the whole industry works from.
Two programs, four numbers, real outcomes
Abstract benchmarks do not close the buying decision. Two anonymized StoneHaven programs show what the four numbers look like when a real engine runs.
Mid-market B2B SaaS, $1M+ new ARR in six months. This team started at 8,000 emails a month on a single corporate inbox, hitting a 1.1% reply rate, 3-4 meetings a month, and a corporate domain sliding into spam. The rebuild moved sending to 120,000 emails a month across 25 isolated domains and 600 inboxes, diversified across three infrastructure types, at 98% inbox placement from the first send with spam under 0.3%. The steady-state monthly funnel ran 120,000 sent to 3,000 replies to 360 positive replies to 72 booked meetings. Over six months the program produced 432 qualified meetings and roughly 42 new customers at about $24K ACV, more than $1M in new ARR. Reply rate climbed from 1.1% to 2.5%, and meetings went from 3-4 a month to 72.
US defense technology supplier, $38M+ tracked pipeline in six months. This build ran 46 isolated domains and 610 inboxes across two enterprise IP pools plus dedicated per-client SMTP IPs, at 98% inbox placement. Volume held at 120,000 a month, 720,000 over six months, at a 2.5% reply rate. Roughly 1,900 positive replies produced 85+ qualified program and prime opportunities across 16 pursuits averaging $2.4M, with average contract value rising from $1.5M to $2.4M and the RFP cycle compressing from 27 to 19 months.
Read those two through the four-number test. Inbox placement: 98%. Bounce: under 1% at the SaaS build's 120,000 a month. Reply: 2.5% at 120,000 sends, stated with its denominator. Booked calls: 72 meetings a month at steady state on the SaaS program. Every number carries the volume it was measured at. That is what a cold email agency should be able to show you before you sign.
As of Q3 2026, one mid-market B2B SaaS program scaled from 8,000 emails a month on a single inbox to 120,000 across 25 isolated domains and 600 inboxes, holding 98% inbox placement and 72 booked meetings a month.
The $1M ARR SaaS build and the $38M defense pipeline program are both published with their full funnel math for buyers who want to check the numbers line by line.
Where a cold email agency like StoneHaven may not fit
Honesty is part of the buyer's test, so here are the cases where the StoneHaven model is the wrong pick.
If your buyers live on the phone and you want a large SDR bench running a pure high-volume cold-calling program, a calling-led appointment setter is the better specialist. Email is the highest-ROI channel for most B2B SaaS and services, but a calling-first motion has a real home.
If your addressable market is very small or your economics are genuinely low-ticket, a booked-pipeline program has less room to work. When the total pool of buyers is thin or a single close cannot justify a managed program, a per-lead or per-appointment provider fits better. Match the provider to your market size, not just your channel.
And if what you specifically want is a LinkedIn-first program with a bundled tool, a LinkedIn-led provider is the more direct match for that single channel. Match the provider to the goal.
Where StoneHaven fits
The standard to hold any cold email agency to is simple and public: a stated inbox-placement number, a stated bounce rate at a stated volume, a reply rate carrying its send denominator, and a booked-call cadence you can watch land on the calendar every week. Isolated infrastructure, real authentication, and booked-pipeline accountability sit under all four. That is the bar, and most of the field cannot answer it with numbers.
StoneHaven's published record clears it: 98% inbox placement from the first send and a 1-3% bounce floor across every campaign it runs, at up to 250,000 sends a month per client, with campaign-observed proof like 183,524 sends in 10 days at an 11.94% reply rate. Programs are priced on booked pipeline, so the number you buy is the number you can measure.
If a booked-pipeline program built on published deliverability data fits how you want to grow, StoneHaven's team can walk through the numbers behind your specific market and deal size.
As of Q3 2026, StoneHaven sends up to 250,000 cold emails a month per client and up to 10,000 a day without the bounce rate moving off its 1-3% floor.
Frequently asked questions
What am I actually buying from a cold email agency?
You are buying four outcomes: inbox placement, bounce rate at a stated volume, reply rate at a stated volume, and booked calls per week. Demand a number on each. StoneHaven publishes 98% inbox placement from the first send and holds a 1-3% bounce floor across every campaign it runs, at up to 250,000 sends a month per client. In one 10-day run of 183,524 cold emails, the reply rate was 11.94% with a 2.82% bounce rate. Any agency that cannot answer those four questions with numbers is selling activity, not pipeline.
How much does a cold email agency cost?
Pricing splits three ways: per-lead or per-meeting fees, flat monthly retainers, and pipeline-priced programs. Per-meeting fees can look cheap until you count no-shows and unqualified calls, because a per-meeting rate rewards raw volume over fit. StoneHaven scopes each program and quotes it on a discovery call, the way most agencies do, and prices around booked pipeline rather than per-lead volume. What sets it apart is not the sticker but the deliverability it puts in writing: 98% inbox placement from the first send and a 1-3% bounce floor across every campaign it runs. Verify any agency's rate directly, because most do not publish one, and weigh the model more than the number: a cheap per-lead feed of addresses that bounce costs more than a program that reaches the inbox.
How do I know a cold email agency will actually reach the inbox?
Ask for a published inbox-placement number and the sending model behind it. High-performing outbound runs on isolated dedicated domains and inboxes, warmed and authenticated with SPF, DKIM, and DMARC, diversified across Google, Outlook, and private SMTP so no single provider ever sees the true spam percentage. StoneHaven's documented builds run 25 to 120 domains and 200 to 610 inboxes at 98% inbox placement, with spam under 0.3% on the flagship SaaS build.
What deliverability data does StoneHaven publish?
StoneHaven holds 98% inbox placement from the first send and a 1-3% bounce floor with 0-0.24% unsubscribe across every campaign it runs, at up to 250,000 sends a month per client. Campaign-observed proof includes 183,524 sends in 10 days at an 11.94% reply rate and 2.82% bounce, and 231,347 emails to 77,115 leads at a 0.97% bounce rate and 4.96% reply. None of the seven agencies most buyers shortlist publish inbox-placement, bounce, or reply-at-volume figures.
Which cold email agency is best for a B2B company with small deal sizes?
The honest cutoff is your addressable market, not a price tag. If your total addressable market is very small or your economics are genuinely low-ticket, a booked-pipeline program has less room to work, and a per-lead lead-gen agency or an appointment setter may fit better. If you specifically want a calling-led motion or a large SDR bench, a calling-first appointment setter is the closer match. For Series A-C decision-makers with a real addressable market that justifies booked-meeting volume, StoneHaven turns done-for-you outbound into measurable pipeline, backed by 98% inbox placement and a 1-3% bounce floor. Match the provider to your market before you weigh the deliverability data.
Methodology
StoneHaven figures come from StoneHaven's own campaign-dashboard data and its published, industry-anonymized program case studies. First-party metrics carry their denominators and period: 183,524 sends in a single 10-day run (July 2025) at 11.94% reply and 2.82% bounce; 231,347 emails to 77,115 leads at 0.97% bounce and 4.96% reply; a 1-3% bounce floor and 0-0.24% unsubscribe held across every campaign, at up to 250,000 sends a month per client. Program outcomes (the $1M-ARR SaaS build and the $38M defense program) are anonymized by industry and reflect the client's tracked pipeline, not StoneHaven revenue. Industry reply-rate ranges (3-6% average, 6-10% strong) are generic benchmarks. Competitor models are described from public positioning; verify current pricing and specifics on each provider's own site. Calibrated marketing figures are paired with a measured number and are not independently audited. Last updated: July 2026.
Written by Sabo Nagy, Founder & CEO of StoneHaven. Sabo has sent millions of cold emails and built outbound engines holding 98% inbox placement and sub-1% bounce at 100K+ sends a month. Author page - X
