Cold Email Inboxes: What They Cost and How to Set Them Up

An honest breakdown of what you're actually buying when you buy cold email inboxes — Google Workspace seats, setup labour, and warmup — plus a practical setup walkthrough covering domains, SPF/DKIM/DMARC, sending limits, and placement testing.

Rana M · GTM Engineer & Founder

Published July 20, 2026 · Updated July 20, 2026

"Cold email inboxes" sounds like its own product category. It isn't. When you buy them you are buying three things bundled together: mailbox seats (Google Workspace or Microsoft 365), setup labour (domains, DNS, connecting to your sequencer), and warmup. Every vendor in this market sells some combination of those three, at some markup.

Once you see the bundle for what it is, the decision gets simpler.

The short version

You are buying Google Workspace or Microsoft 365 seats either way. The mailbox itself is a commodity.
Google Workspace Business Starter lists at $7/user/month on annual billing. That's your reference price.
We resell Google Workspace inboxes at $3/user/month — roughly 57% below Google's list price — as real seats on your own domains.
Managed cold-email-infrastructure vendors bundle seats with domains, DNS setup, warmup and monitoring, at a premium over raw seat cost. That's a legitimate trade: you pay more, someone else does the work.
Nobody can sell you inbox placement. Setup and authentication are table stakes; placement is driven by your list, your copy, and recipient engagement.
Run your own placement test before committing volume. Published benchmarks from anyone else's infrastructure won't predict yours.

What you're actually paying for

Break any cold email infrastructure offer into its parts and you get four line items:

The mailbox seat. A Workspace or Microsoft 365 licence — the same product whoever sells it to you.
The domain. A registration fee, usually a few dollars a year per domain.
Setup labour. Buying domains, configuring DNS, creating users, verifying, connecting each mailbox to your sequencer. Repetitive work that scales linearly with mailbox count.
Warmup. A warmup tool subscription, or a manual ramp schedule you follow.

That's the whole product. Everything else is packaging.

Why seat cost dominates the budget

Safe cold email means low daily volume per mailbox, so meaningful send volume implies a lot of mailboxes. At ten mailboxes a per-seat difference is survivable. At fifty or a hundred — a normal footprint for a team running serious outbound — seat cost becomes one of the largest recurring line items in the entire motion, and the difference compounds every month you keep sending.

The four routes, compared

Route	What you actually get	Roughly what drives the cost	Best for
Provision Google Workspace seats yourself	Real Workspace seats bought direct from Google, on domains you register. You do all DNS, user creation and warmup.	Google list price (~$7/user/mo annual) + domain registrations + your own time	Teams comfortable in a DNS panel, provisioning a modest batch, who want full control
Buy through a reseller (us, from $3/user/mo)	The same real Workspace seats on your own domains, administered by you — at reseller pricing instead of list	Discounted per-seat price + domain registrations + your own setup time	Teams who want the cheapest genuine Workspace seats and will own the setup
Managed cold-email-infrastructure vendors	Seats bundled with domains, DNS records, warmup and ongoing monitoring, provisioned for you	Seat cost plus a premium for setup labour, warmup tooling and monitoring	Teams who want it done for them, or need a large batch provisioned fast
Microsoft 365 mailboxes	Microsoft-hosted mailboxes on your domains; same authentication requirements, different admin console	Microsoft per-seat licence + domains + setup	Teams already standardised on Microsoft, or deliberately diversifying providers

Where the managed category fits

Vendors such as Mailforge, InboxKit, Zapmail, Premium Inboxes and Puzzle Inbox operate in the managed space, reselling Google Workspace or Microsoft 365 mailboxes bundled with setup, DNS and warmup. I haven't tested them against each other and I won't rank them or attach numbers to them — I have no data that would make that honest.

What I will say is that the category is a legitimate choice. Provisioning fifty mailboxes by hand is a genuinely tedious afternoon, and paying someone to remove that afternoon is a reasonable purchase. If you want cold email infrastructure fully done-for-you, a managed vendor may suit you better than we do — we sell the seats cheaply, not the labour.

Our argument is narrower and, I think, harder to dispute: you are buying Google Workspace seats either way. At $3/user/month you get those seats at roughly 57% below Google's own list price, without a managed premium layered on top. Whether that premium is worth paying is your call — but make it knowing what the underlying seat costs.

Full detail on Google's tiers and billing is in our Google Workspace pricing guide. If you're wondering whether free Gmail could do this at all, our Gmail vs Google Workspace comparison covers why it can't — cold outreach needs a custom domain whose DNS you control, and free Gmail doesn't give you one.

One thing the premium does not buy

Deliverability. Nobody can sell you inbox placement, because placement is overwhelmingly determined by what you send, to whom, and how they react. Correct setup and authentication are table stakes — get them wrong and you're guaranteed spam; get them right and you've merely earned the right to be judged on your content and list quality.

The setup walkthrough

Here's the order I'd set it up in.

1. Buy secondary domains

Never send cold email from your primary company domain. If a campaign goes badly, you don't want invoices, support replies and contract threads caught in the blast radius.

Register secondary domains that clearly relate to your brand — variations like getbrand.com, brandhq.com, try-brand.com, or .co/.io alternatives.
Keep them recognizable. A prospect who Googles the domain should find something coherent.
At minimum, point each domain at your real site.

2. Create a small number of mailboxes per domain

Spread mailboxes across domains rather than stacking them. Reputation attaches substantially to the sending domain, so a domain carrying a handful of mailboxes limits how much capacity any single reputation problem takes offline. Twenty mailboxes on one domain is one very large single point of failure.

A few mailboxes per domain is a common configuration — efficient, but losing one domain isn't a crisis.
Use real-looking human addresses (firstname@, firstname.lastname@), not sales@ or info@.

3. Set up SPF, DKIM and DMARC

The authentication stack — non-negotiable, all three published as DNS records on each sending domain:

SPF publishes which servers may send mail for your domain; receivers check the sending IP against it. For Workspace, that means including Google's SPF record.
DKIM cryptographically signs outgoing messages so recipients can verify they genuinely came from your domain, unaltered. Generate the key in the admin console and publish the public half in DNS.
DMARC tells receiving servers what to do when SPF or DKIM fails, and where to send reports. Start on a monitoring policy so you can observe before enforcing anything stricter.

Get all three live and verified before the mailbox sends its first message. Sending unauthenticated mail from a brand-new domain is the fastest way to poison it.

4. Warm up before you ramp

New domains and mailboxes have no sending history, and mailbox providers treat that absence as grounds for suspicion. You build history deliberately: low initial volume, increasing gradually, with genuine-looking engagement.

Warmup periods for new domains and mailboxes are commonly cited in the two-to-three week range before full-volume sending. Treat that as conventional guidance, not a guarantee — the point is the shape of the ramp, not a specific day count. Most sequencers now include warmup, or you can run a dedicated tool.

The failure mode I'd warn against hardest: buying a batch of mailboxes and immediately blasting at full volume. You'll burn the domains and start over, having paid for both the domains and the wasted weeks.

5. Set conservative per-mailbox sending limits

Once warm, keep daily volume per mailbox modest and scale by adding mailboxes, not by pushing each one harder. A mailbox sending a small, human-plausible number of messages a day looks like a person. The same mailbox sending hundreds looks like exactly what it is.

This is why the arithmetic pushes toward many cheap mailboxes rather than a few hard-working ones — and why per-seat cost drives the whole budget.

6. Test placement before you commit volume

Before pointing a real campaign at new infrastructure, run a placement test. Seed-list tools send from your mailboxes to test accounts across Gmail, Outlook and others, then report where each message landed.

I'm deliberately not quoting a placement figure here. Yours will depend on your domains, your copy, your list and your ramp — not on anyone else's published test. Run the test on your own setup, fix what it surfaces, and re-run after changes. That number is the only one that means anything to you.

Frequently asked questions

How many cold email inboxes do I need?

Work backwards: divide your target daily send volume by a conservative per-mailbox daily limit. Because the safe per-mailbox number is low, meaningful volume implies a lot of mailboxes — which is exactly why seat pricing dominates the budget.

Should I buy managed inboxes or set them up myself?

Managed vendors bundle domains, DNS, mailboxes and warmup and charge for the labour. Self-provisioning costs seat price plus domains plus your time. If you're comfortable editing DNS records and provisioning a modest batch, do it yourself. If you need a large batch fast or don't want to own maintenance, the premium may well be worth it. Either way, know the underlying seat cost before you decide.

Do I need separate domains for cold email?

Yes. Send from secondary domains, never your primary company domain — reputation damage should never touch the domain your business actually runs on. Spread mailboxes across several secondary domains so no single one is a critical dependency.

How long does warmup take?

Two to three weeks is the commonly cited range for new domains and mailboxes before full-volume sending. It's a gradual ramp, not a switch — start low, increase steadily, and don't skip it because the campaign is ready.

Does a more expensive provider get better inbox placement?

Not inherently. A provider can supply correct setup and authentication, which is necessary but not sufficient. Placement is driven mostly by list quality, copy and recipient engagement. Anyone promising you a placement rate is promising something outside their control.

Are these real Google Workspace accounts?

The ones we resell are — genuine Workspace seats on your own domains, administered by you. That's the thing to verify with any provider: whether you're getting licensed mailboxes you control, or access to something you don't own.

Sources

Vendor pricing and programme terms change. These were the pages we checked in July 2026 — if you spot a figure here that no longer matches, tell us and we'll correct it.