A cold email agency runs your outbound sending for a monthly fee. The work splits four ways: building the list, standing up domains and mailboxes, writing the sequences, and handling the replies. Agencies differ less on what they do than on what they own, what you have to supply, and what leaves with them when you cancel. Those three answers are the comparison.

What does a cold email agency actually do?

Four jobs, and no agency owns all four cleanly.

Build a list of accounts and the people inside them. Stand up domains and mailboxes that can send at volume without landing in spam. Write and run the sequences. Read the replies and book the ones that are real.

The agencies describe it in those terms themselves. SalesHive says its flat monthly fee covers "your dedicated strategist, US-based responder, the AI platform, data, and sending infrastructure". Belkins lists GTM strategy, manual lead generation and enrichment, a dedicated account manager and SDR, copywriting, deliverability maintenance, appointment scheduling and no-show recovery.

Both lists are accurate, and neither says where their work stops and yours starts. That line is what you are buying.

What should a cold email agency retainer include?

Read the retainer as a list of problems that stop being yours.

Job Typically the agency Typically you If you ran it in-house
List building Sourcing, verification, enrichment Approving the segment definition A data subscription plus a person to run it
Sending infrastructure Buying domains, warming mailboxes, monitoring deliverability DNS access, or buying dedicated domains Domains, a sending tool, warmup time
Copy and sequences Writing and testing the messages Approving them, supplying the offer A copywriter who understands the segment
Reply handling and booking Reading replies, qualifying, booking calendars Taking the meetings An SDR
Segment and offer strategy Recommending Deciding Yours either way

The bottom row is the one that goes wrong. Deciding which accounts are worth the cost of contact is your call, and an agency that takes it has been handed the part of the job it knows least about.

Published prices are rare. SalesRoads publishes $11,950 per 4-week engagement for one dedicated SDR. Belkins advertises a starter package from $5,000 with 1,500 leads a month, while its own pricing page names tiers and appointment volumes without attaching a figure to any of them. SalesHive states that plans are custom quoted. Callbox says pricing varies by campaign scope and asks you to book a consultation. Opaque pricing is the norm here rather than a warning sign, so the first call is a pricing call. Walk in with a number.

Two structures sit under those retainers. Most are a flat monthly fee. Some are not: Cleverly's Scale plan is pay per lead, and two of Martal's tiers are a flat fee per month plus sales commission. Neither is wrong, and they buy different behaviour. Pay per lead pays for the count, so the definition of a lead becomes the most important sentence in the contract.

How do you tell a good cold email agency from a bad one?

Four questions, all answerable on the first call.

Who owns the domains and mailboxes? Agencies send from separate domains rather than your main one: SalesHive states that outreach runs from "lookalike sending domains, keeping your primary domain reputation clean". Sensible, and it means the sending reputation you spend a quarter building sits on assets someone else registered. A due-diligence guide for this purchase puts it plainly, "Who owns every domain and mailbox?" and "Which assets and records are exported at termination?", advising you to never grant access until ownership, authentication, sending limits, suppression data and the shutdown procedure are documented.

What reply rate do you expect, and whose benchmark is that? Three platforms published a figure in the past year and they do not agree. Instantly reports a 3.43% average reply rate across billions of interactions in 2025. Saleshandy reports 3.7%, from 53 million emails sent in the first half of 2026. Smartlead reports a median of 0.74%, one reply per 135 contacts, from more than 850 million emails. One is five times another, and each is published by the platform measuring its own users. An agency quoting an industry average is quoting one of them; a useful answer names which, and for what kind of list.

What spam complaint rate do you operate to? Google requires senders to keep Postmaster Tools spam rates below 0.3%, and senders of more than 5,000 messages a day to Gmail accounts carry extra requirements on DMARC, From-domain alignment and one-click unsubscribe. An agency that cannot say what its complaint rate ran at last month is not watching the number that ends programs.

Why this account, this quarter? Ask for a trigger, not a filter. "Series B SaaS, 50 to 200 staff" is a filter and everyone has it. "They posted three roles that only make sense if they are rebuilding the function" is a trigger. An agency without an answer is selling volume against a filter, the motion most teams are trying to leave.

We run a managed outbound program, so this page is written by an interested party. Every check above is one you can run without talking to us.

What are the red flags in an agency pitch?

Four, and three of them are on pages ranking for this term today.

When is a cold email agency the wrong choice?

Four situations, and the first is the most common.

Below roughly 1,000 named accounts. At that size a person can research every account properly and write to each one, which beats any sequence. Account-based marketing is the method, and paying for a sending operation instead is expensive in a way that shows up in quarter two.

Nobody in-house to work the meetings. Booked calls that nobody prepares for or follows up on convert at close to nothing, and the agency gets blamed for it. Two people with calendar space is the floor.

The deal size cannot absorb the retainer. At $11,950 per 4-week engagement, the arithmetic only works if a handful of closed deals covers the year. Below roughly $20,000 ACV, or a customer lifetime value under about $50,000, the cost per meeting has to be very low, which is what volume sending is now worst at.

The offer is the problem, not the channel. If warm introductions do not convert either, cold email will find the same wall faster and at higher volume. The order of diagnosis, and the numbers to check first, are in cold email response rate benchmarks and what to check.

The in-house comparison is worked through in why hiring your next SDR is probably a mistake, and the managed-versus-DIY argument, from our side of the table, is in building an outbound motion in 30 days.

Frequently asked questions

Which cold email agency is the best?

No ranking survives contact with your segment, and the lists published for this query are written by agencies or by software vendors selling an alternative. Pick on three answers instead: who owns the domains and data, what the cancellation procedure is, and whether they can name a trigger in your market rather than a firmographic filter. Those separate operators from packagers faster than any review score.

What does a cold email agency cost per month?

Most publish nothing. Where they do, SalesRoads lists $11,950 per 4-week engagement for one SDR and Belkins advertises from $5,000 for a starter package. Budget separately for domains, mailboxes and data if the retainer excludes them. Programs that also build the segment research and the per-prospect assets, ours included, cost more than a sending retainer, and the gap widens with how much of the market is worked.

What happens to our sending domains and data if we cancel?

Whatever the contract says, which is usually nothing. Agencies commonly send from lookalike domains they register, as SalesHive describes with "lookalike sending domains". Get three things in writing before granting access: who the registrant is, what the export at termination contains, and whether the suppression list comes with you. A due-diligence guide for this purchase recommends exactly that, documenting ownership and the shutdown procedure first.

How long before a cold email agency books meetings?

Four to eight weeks in practice, and the delay is mailbox warmup rather than effort. Salesforge calls two weeks the practical floor for a new mailbox, with many operators running three to four weeks. Published launch timelines cluster around two weeks, and Cleverly states clients begin seeing replies and meetings within 4 to 6 weeks. Month one buys infrastructure, not pipeline.

Is a lead generation agency the same as a cold email agency?

Overlapping, not identical. A cold email agency owns one channel end to end. A lead generation or appointment setting agency usually spans channels: SalesRoads bundles outbound calling with email prospecting under a per-SDR price. The practical difference is the unit you buy, a sending program versus a person's time, and which one fits depends on whether phone works in your market.

Do we need consent to send cold email in the US or the UK?

In the US, no prior consent, but CAN-SPAM requires a clear opt-out explanation, opt-outs honoured within 10 business days, a valid physical postal address and accurate header information. In the UK, PECR lets you email any corporate body: a company, Scottish partnership, limited liability partnership or government body. Rules differ elsewhere, so ask an agency which rule it operates under in each market you sell into.