Cheap Inboxes for Cold Email: What They Cost, What's Safe, and How to Buy Them

Cheap cold email inboxes cost roughly $1-$4 per mailbox per month. The cheapest option that is actually safe to build a pipeline on is an authorized Google Workspace or Microsoft 365 mailbox that you own outright, with your own admin access. Inboxlogy starts at $2.80/mailbox/month with $0 setup, billed monthly. Anything priced well under $1 is usually a shared-tenant resell or a non-authorized account, and the money you save is repaid later in suspensions, lost domains, and dead sending weeks.

This article is the buying guide I'd want if I were spending my own money: what you're actually purchasing, how to compare prices honestly (including the case where the cheap provider genuinely wins), how to size your order so you stop overpaying, and the specific questions that separate a cheap provider from a bad one.

What is a "cheap inbox," and what are you actually buying?

"Inbox" in the cold email market means a sending mailbox on a domain you control, connected to a sequencer like Instantly, Smartlead, or ReachInbox. When someone sells you one for a few dollars a month, you're buying some combination of five things:

• A mailbox license. A seat on Google Workspace, Microsoft 365, or a private mail server.
• A domain. Sometimes included, usually billed separately at registrar cost (~$10-15/year for a .com).
• DNS configuration. SPF, DKIM, DMARC, MX, and tracking records set correctly on each domain.
• Sending IPs. Shared by default; dedicated IPs (and a choice of US or EU) are a paid differentiator.
• Admin and API access. Whether you can log into the tenant, add or remove users, export data, and automate provisioning.

Price differences between providers are almost entirely explained by which of those five you actually get, and by whether the license is legitimately licensed to you. Two offers at $2 and $0.60 are not the same product at different margins. They're different products.

The four things sold as "cheap inboxes"

• Authorized Workspace / M365 mailboxes you own. The provider is an authorized reseller or partner, the tenant is yours, you're a super admin, and you can walk away with your domains and data. This is the floor for "cheap but safe." Expect ~$2-4/mailbox/month.
• Shared-tenant resells. Dozens or hundreds of customers' mailboxes live inside one Workspace or M365 tenant that someone else owns. Cheapest of the legitimate-looking options. The problem is collective liability: another customer's spam complaints can get the whole tenant flagged, and you have no admin access to see it coming or respond.
• Non-authorized or "panel" accounts. Accounts created through promo abuse, stolen payment methods, aged account marketplaces, or reseller credentials being used outside their terms. These are the sub-$1 listings. They work until enforcement catches up, which is a question of when.
• Private SMTP / self-hosted mail servers. A VPS, Mailcow or Postal, your own IPs. Genuinely cheap at volume if you have the skills, and fully yours. But you are now the postmaster: IP warming, blocklist monitoring, PTR records, TLS, feedback loops, and Microsoft's consumer-domain filtering are your problem, and B2B inboxing from a fresh self-hosted IP is materially harder than from Google or Microsoft.

How much should a cheap inbox cost?

Work it out from the floor rather than from the market's marketing. A legitimate Workspace or M365 business seat has a published list price per user per month. Look it up today, since both vendors change it. A provider selling you an owned, authorized mailbox for well under that list price is doing it through volume licensing, partner pricing, and the fact that most cold email mailboxes use almost none of the storage and support a normal employee does.

So a reasonable expectation in 2026:

• $2-4/mailbox/month for authorized, owned Google Workspace or Microsoft 365 mailboxes with DNS handled and admin access.
• $0.50-1.50/mailbox/month for shared-tenant mailboxes where you don't own the tenant.
• Under $0.50/mailbox/month is below the cost of a legitimate license. Assume the license isn't legitimate.
• Plus ~$1/month per domain amortized from registrar cost, regardless of provider.
• Setup fees are negotiable and often avoidable. Inboxlogy charges $0 setup and bills monthly. A provider demanding six months prepaid plus onboarding is asking you to carry their churn risk.

How do you compare inbox prices fairly?

Most comparisons stop at price per mailbox, which is the least useful number. Compare 12-month cost of a working sending system, including replacement cycles. Here's the arithmetic with every assumption labeled. Swap in your own.

Target: 1,000 cold emails per working day. At a conservative 25 sends/mailbox/day, that's 40 mailboxes, and at 3 mailboxes per domain, 14 domains.

Provider A, shared tenant, $1.20/mailbox: $48/month in mailboxes. Provider B, owned authorized mailboxes, $2.80/mailbox: $112/month. Provider A looks 2.3× cheaper, and on cost per delivered email it may genuinely be cheaper while it's running. That part is real and worth admitting.

Now add the failure mode. Assume Provider A's tenant gets flagged twice a year and you rebuild: new domains (14 × $12 = $168), re-ramp, and roughly three weeks of near-zero sending each time.

• Provider A, 12 months: $576 mailboxes + $336 replacement domains + ~6 weeks of dead pipeline = ~$912 and 10.5 productive months.
• Provider B, 12 months: $1,344 mailboxes + $168 domains once = ~$1,512 and 12 productive months.

Provider B costs about $600 more per year and buys you six more weeks of sending. If 1,000 emails/day produces even one or two meetings a week for you, the six weeks are worth multiples of $600. That's the whole case for paying $2.80 instead of $1.20. If your sending is low-stakes or experimental, the cheap option may genuinely be the right call. Run your own numbers; don't take the conclusion on faith.

The item that doesn't show up in either column is domain reputation. Domains are cheap to replace, but a domain that accumulated spam complaints inside a flagged tenant is not usefully recoverable on a timeline that matters. Treat domains as consumables and the reputation on them as the real asset.

How many inboxes do you actually need?

This is the biggest lever on your bill, and most teams get it wrong in the expensive direction. The formula:

Mailboxes = (target sends per day) ÷ (sends per mailbox per day)

Conventional practice for cold email is 20-30 sends per mailbox per day on an established mailbox, ramping from single digits over the first two to three weeks. At 25/day:

• 200 emails/day → 8 mailboxes → ~3 domains
• 500 emails/day → 20 mailboxes → ~7 domains
• 1,000 emails/day → 40 mailboxes → ~14 domains
• 3,000 emails/day → 120 mailboxes → ~40 domains

Two corrections that save real money. First, people buy for peak volume they never hit. If your list is 4,000 contacts and your sequence is 3 steps, that's 12,000 sends total. Spread over six weeks that's ~450/day, not 1,000. Buy 20 mailboxes, not 40. Second, more mailboxes do not fix bad targeting. If replies are flat, adding mailboxes multiplies the volume of a message that isn't working and accelerates complaints. Fix the list and the offer at 200/day before you pay for 1,000/day.

Also budget 2-3 mailboxes per domain, not 10. Concentrating many senders on one domain concentrates risk, and domains are the cheapest component in the stack.

What should you ask before buying cheap inboxes?

Send this list to any provider before you pay. A good one answers all nine in a few sentences; a bad one gets vague on the first three.

• Do I own the tenant, and am I a super admin? Ask for a screenshot path to the admin console. If the answer is "we manage it for you," you don't own it.
• Is the license authorized by Google or Microsoft? Ask how. Reseller, partner, or direct: there should be a concrete answer.
• Is my tenant isolated, or shared with other customers? Shared isn't automatically disqualifying, but you must know, because it determines whether someone else's behavior can take you down.
• Who else sends from my IPs? And can I get dedicated IPs, in a region I choose? Region matters for EU prospects and for GDPR-sensitive buyers.
• Who controls DNS? You should hold the registrar account or at minimum have full record access. SPF, DKIM, and DMARC should be configured automatically and verifiably. Check each one yourself after provisioning.
• Can I export mailbox data and leave? Including conversation history and the domains themselves.
• Is there an API? Below ~30 mailboxes this is convenience. Above that, provisioning, rotating, and retiring mailboxes by hand is a part-time job.
• What's the billing term? Monthly with no setup fee means the provider is confident in retention. Long prepay on a cheap product is a yellow flag.
• What happens when a mailbox is suspended? Replacement policy, timeline, and whether you get an explanation.

Inboxlogy was built around the first six of those answers: authorized Google Workspace and Microsoft 365 mailboxes, 100% ownership with admin access, dedicated US or EU IPs, automated SPF/DKIM/DMARC, a full API, and monthly billing from $2.80 with no setup fee. If a competitor answers all nine as well for less, buy theirs. The point of the checklist is that the answers are the product.

Who runs warmup, and what does it cost?

An important clarification, because it's where pricing comparisons get muddled. Warmup is a function of your sending tool, not your infrastructure provider. Instantly, Smartlead, and ReachInbox all include warmup networks in their subscriptions; you connect your mailboxes and the tool handles the ramp. Inboxlogy does not run warmup. It provisions the mailboxes and DNS and hands them over to you, and warmup runs in whichever tool you've connected.

Practically, this means two things. If a provider's price looks high because "warmup is included," check whether you're paying twice for something your sequencer already does. And if a provider's price looks low, confirm you have a sending tool that can warm the mailboxes. New mailboxes pushed straight to 25/day with no ramp will underperform regardless of how good the infrastructure is.

When is cheap actually fine, and when is it false economy?

Cheap is fine when:

• You're validating a channel and want 10-20 mailboxes for 60 days before committing.
• Your sending is low-volume and low-stakes, and a two-week outage costs you little.
• You have the operational skill to run self-hosted mail and the volume to justify it.
• The provider is cheap because of volume licensing and thin margins, not because the license is improper.

Cheap is false economy when:

• Your pipeline depends on the channel. A flagged tenant becomes a revenue event, not an IT event.
• You're sending on your main brand domain's subdomains, where reputation damage reaches your transactional and recruiting mail.
• You're in a regulated or enterprise-sold category where a prospect's security team may ask where your mail originates.
• You can't log into the tenant. With no admin access, you don't learn about a problem until your sequencer starts throwing auth errors.

How do you cut your inbox bill without hurting deliverability?

Before you switch providers to save a dollar per mailbox, there's usually 30-50% of waste in how the mailboxes are used:

• Retire idle mailboxes monthly. Most accounts accumulate mailboxes attached to paused campaigns. On monthly billing, deleting 12 unused mailboxes at $2.80 saves $400/year immediately.
• Right-size to real list volume using the formula above instead of to an aspirational target.
• Consolidate sending tool seats. Sequencer pricing often scales with contacts or users, and that bill is frequently larger than the mailbox bill. Audit both.
• Buy domains at registrar cost rather than marked up through an infrastructure vendor, and register for multiple years when a registrar's renewal price jumps after year one.
• Don't pay for premium TLDs. A $40 .io adds nothing to deliverability over a $12 .com, and .com generally reads as more legitimate to recipients anyway.
• Improve replies instead of adding volume. Doubling reply rate halves the mailboxes you need for the same number of meetings. That's the only cost reduction that also reduces risk.

How do you test a cheap provider before moving everything?

Run a 14-day pilot with 10 mailboxes on 3-4 fresh domains. It costs about $30 and tells you nearly everything:

• Day 0: Confirm you can log into the admin console as super admin and create a test user yourself. If you can't, stop here.
• Day 0: Independently verify SPF, DKIM, and DMARC on every domain with a public DNS lookup, not the provider's dashboard. Confirm DMARC is present and not set to something permissive you didn't choose.
• Day 0: Check the sending IPs and confirm region and whether they're dedicated. Run them against public blocklists.
• Days 1-14: Connect to your sequencer, let warmup ramp, then send a small real campaign and run a placement test to seed addresses at Gmail and Outlook. Note Microsoft placement specifically. It's typically the harder of the two.
• Day 14: Test the exit. Ask for a data export and confirm you can move a domain's DNS away. A provider that makes leaving hard at 10 mailboxes will make it much harder at 100.

Only after the exit test passes should you scale. The order matters: cheap providers are easy to buy and expensive to leave.

Frequently asked questions

What is the cheapest safe way to buy cold email inboxes?

Authorized Google Workspace or Microsoft 365 mailboxes in a tenant you own, with your own admin access, at roughly $2-4/mailbox/month plus ~$1/month per domain. Inboxlogy's entry price is $2.80/mailbox/month with $0 setup and monthly billing. Below about $0.50/mailbox you're below the cost of a legitimate license.

Are $1 inboxes a scam?

Not necessarily a scam, but usually a different product: a mailbox inside someone else's shared tenant, or an account created outside Google's or Microsoft's terms. They often work for a while. The risk isn't that you lose a dollar, it's that a suspension takes your domains' reputation and two to three weeks of sending with it.

How many cheap inboxes do I need for 1,000 emails a day?

About 40 mailboxes at 25 sends per mailbox per day, spread across roughly 14 domains at 2-3 mailboxes each. Plan on two to three weeks of ramp before mailboxes reach full volume, so order ahead of when you need the capacity.

Is warmup included when I buy inboxes?

It depends on the provider, and it's worth checking so you don't pay twice. Warmup is normally run by your sending tool. Instantly, Smartlead, and ReachInbox all include it. Inboxlogy does not run warmup; it provisions the mailboxes, IPs, and DNS, and warmup happens in whichever tool you connect them to.

Can I just self-host to save money?

Yes, and at high volume it's the cheapest option per mailbox, but you take on IP warming, blocklist monitoring, PTR and TLS configuration, and feedback loops. Inboxing to Microsoft from a fresh self-hosted IP is meaningfully harder than from Google or Microsoft infrastructure. Self-host if mail operations is a skill you already have; otherwise the $2-4/mailbox is buying deliverability, not convenience.