Cheap Inboxes vs InboxKit
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
Still shortlisting? Browse the best in Cold Email Infrastructure for every option we track, with award winners called out.
The short answer
Both sides assessedCheap Inboxes compared with InboxKit
InboxKit starts around $2.50 per mailbox on annual billing, adds Azure tenants as a flat-rate volume option, and ships an MCP server and paid monitoring. Cheap Inboxes is month to month from $3.50, has no Azure option, and competes on workspace isolation, automatic reconnection, and round-the-clock human support. Choose InboxKit for the lowest unit cost at scale with a commitment, Cheap Inboxes for monthly flexibility and support.
InboxKit compared with Cheap Inboxes
Cheap Inboxes is month to month from $3.50 per mailbox with no Azure option, and competes on one domain per workspace, automatic OAuth reconnection, and round-the-clock human support. InboxKit starts around $2.50 on annual billing, adds Azure tenants as a flat-rate volume option, and ships an MCP server and InfraGuard monitoring. InboxKit wins on unit cost at scale and on tooling; Cheap Inboxes wins on monthly flexibility and support response.
Choose Cheap Inboxes if
Agencies and outbound teams that want real Google or Microsoft mailboxes at a published per-mailbox rate without a bundle to buy into, isolated one domain per workspace, and support that answers at 2 a.m. when a client's campaign goes dark.
Choose InboxKit if
Outbound teams and agencies that want genuine Google, Microsoft, or Azure mailboxes rather than private SMTP, published per-mailbox pricing rather than a sales call, and the ability to provision, monitor, and retire infrastructure programmatically from an API, a script, or an AI assistant instead of a support channel.
Side by side
13 attributes| Attribute | Cheap Inboxes | InboxKit |
|---|---|---|
| Category | Infrastructure | Infrastructure |
| Starting price | $3.50 per mailbox per month (free trial) | About $2.50 per mailbox per month on annual billing |
| Pricing model | Per mailbox per month on published volume bands, identical for Google and Microsoft, with domains sold separately per year and no setup fee. | Pay-as-you-go against a wallet balance, priced per mailbox per month for Google and Microsoft accounts and per tenant for Azure, with warmup and InfraGuard monitoring as separate add-ons and domains billed separately. |
| Free plan | No | No |
| Free trial | None published | No |
| Best for | Agencies and outbound teams that want real Google or Microsoft mailboxes at a published per-mailbox rate without a bundle to buy into, isolated one domain per workspace, and support that answers at 2 a.m. when a client's campaign goes dark. | Outbound teams and agencies that want genuine Google, Microsoft, or Azure mailboxes rather than private SMTP, published per-mailbox pricing rather than a sales call, and the ability to provision, monitor, and retire infrastructure programmatically from an API, a script, or an AI assistant instead of a support channel. |
| Setup time | The FAQ describes automated setup in about ten minutes and the comparison table says same day, while the fulfillment policy says setup typically takes about 48 hours and longer for large orders. Plan on up to two days, then a gradual ramp. | About ten minutes of configuration, with mailboxes typically delivered inside thirty to a hundred and twenty minutes. Real sending volume still waits on warmup, so plan two to three weeks before a new estate is at full capacity. |
| Learning curve | Low. Ordering, domain import, and sequencer export are a few screens, and support will do the migration for you if asked. The judgement that remains is daily caps and how many mailboxes to put on each domain. | Low for the console, moderate for the judgement. Buying and connecting mailboxes is simple. What takes discipline is holding to a sane number of mailboxes per domain, ramping slowly, and acting on InfraGuard alerts rather than filing them. The Azure tenant option adds real administrative learning if you take it. |
| Platforms | Web app, REST API, OAuth connection to sequencers | Web app, REST API, Webhooks, MCP server, Provider admin panels for Google, Microsoft, and Azure |
| Compliance | Mailboxes are official Google Workspace Business Starter and Microsoft accounts, subject to those providers' policies, WHOIS privacy on purchased domains, Terms of service governed by the laws of Wisconsin, No compliance certifications published; CAN-SPAM and GDPR sender obligations remain the customer's | SPF, DKIM, and DMARC configured automatically on every provisioned domain, Two-factor authentication on provider admin panels, with app passwords used for sequencer credentials, CAN-SPAM and GDPR sender obligations remain entirely the customer's, since InboxKit supplies infrastructure and never touches campaign content |
| Founded | 2024 | 2024 |
| Headquarters | Not disclosed | Dubai, United Arab Emirates |
| Ownership | Privately held | Privately held |
Strengths and limitations
Cheap Inboxes
Strengths
- Published per-mailbox bands from $3.50 down to $2.80, with no bundle minimum and no setup fee.
- Google and Microsoft at the same price, which makes a mixed pool simple to budget.
- One domain per isolated workspace with full admin access.
- OAuth connections to sequencers with automatic reconnection when a mailbox drops.
Limitations
- No refund if Google suspends an inbox or domain, under the terms of service.
- Setup-time claims are inconsistent, from about ten minutes in the FAQ to a typical 48 hours in the fulfillment policy.
- Pre-warmed is a vendor claim, not a placement guarantee.
- Seven days' notice is requested before cancellation, and pricing on inboxes older than a year can be adjusted.
InboxKit
Strengths
- Genuine Google Workspace, Microsoft 365, and Azure accounts rather than private SMTP dressed up as provider mailboxes.
- The lowest published price for real provider-account mailboxes in this category, with the rates on the site rather than behind a sales call.
- Azure tenants at a flat monthly rate for up to a hundred mailboxes, which is the cheapest published route to volume anywhere in this layer.
- A full REST API with webhooks at every tier, not gated behind an enterprise plan.
Limitations
- Not a sending platform, so it is always a second bill alongside a sequencer.
- Warmup and monitoring are add-ons rather than included, so the headline per-mailbox price is roughly half the real running cost.
- The Azure tenant option is only cheap if you are prepared to administer a Microsoft tenant, which is genuine operational work most small teams underestimate.
- Self-serve by design, so buyers who want a managed service with an operator in a Slack channel are better served elsewhere in this category.
Pricing compared
Cheap Inboxes
Per mailbox per month on published volume bands, identical for Google and Microsoft, with domains sold separately per year and no setup fee.
- 1 to 99 mailboxes$3.50
- 100 to 249 mailboxes$3.25
- 250 to 999 mailboxes$3.00
- 1,000 mailboxes and above$2.80
At 10,000 cold emails a month and about 30 sends a day per mailbox you need roughly fifteen mailboxes, which is about $52.50 a month plus a few domains at $10 a year, for official Google or Microsoft accounts in isolated workspaces. At 100,000 a month you need on the order of 110 to 150 mailboxes, landing in the $3.25 band at roughly $360 to $490 a month. That is close to Premium Inboxes, whose bands start at the same $3.50 and reach the same $2.80, but Cheap Inboxes reaches its lower rates sooner, at 100 and 1,000 mailboxes rather than 250 and 1,250. Against Zapmail's $39 for ten it is slightly dearer at the bottom and similar in the middle, without a bundle to buy into. The value case is not the name; it is published rates with no package minimum, one domain per workspace, and support that answers quickly. The refund exclusion for Google suspensions is the cost of that price.
InboxKit
Pay-as-you-go against a wallet balance, priced per mailbox per month for Google and Microsoft accounts and per tenant for Azure, with warmup and InfraGuard monitoring as separate add-ons and domains billed separately.
- Professional$39
- Agency$99
- Enterprise$299
- Azure tenant$30
- Add-ons$3
On published prices InboxKit is the cheapest genuine provider-account mailbox in this category, undercutting Primeforge at $4.50 a slot and Premium Inboxes at $3.50, and sitting far below buying Google Workspace or Microsoft 365 seats directly at $6 to $7 each. It is not the cheapest mailbox available, because private SMTP vendors like Maildoso go under a dollar, but that is a different product with lower per-mailbox throughput. The honest comparison at thirty mailboxes is roughly $99 a month here against about $135 at Primeforge and about $105 at Premium Inboxes, before warmup, with the API, the MCP server, and the workspace tooling included rather than gated. Add warmup and InfraGuard and the effective cost roughly doubles, which is the number to use when comparing against vendors that bundle warmup into the sticker price.
Editorial verdict on each
Cheap Inboxes
Cheap Inboxes is a well-assembled provider-mailbox vendor under an unfortunate name. Official Google and Microsoft accounts at one published price from $3.50 down to $2.80, no bundle to buy into, one domain per isolated workspace with admin access, OAuth connections that reconnect themselves, a real API, and support that answers around the clock is exactly what an agency running dozens of clients needs from this layer. The terms deserve a read before you sign: no refunds for Google suspensions, seven days' notice to cancel, room to reprice inboxes after a year, and setup-time claims that range from ten minutes to two days. The company itself is young and publishes little. For a small team that wants twenty-five real mailboxes without buying thirty, or an agency that values fast human support over a managed service, it belongs on the shortlist next to Premium Inboxes and Zapmail.
Read the full Cheap Inboxes profileInboxKit
Category LeaderEase of UseInboxKit is the most complete self-serve product in cold email infrastructure right now. It sells the mailbox type most buyers actually want, genuine Google, Microsoft, and Azure accounts, at the lowest published price in the category, and it is the only vendor here built on the assumption that infrastructure should be provisioned by software rather than by a support channel. The API at every tier and the MCP server are not marketing garnish; they change how an agency onboards clients and how an operator manages an estate of hundreds of mailboxes. Two caveats belong in any decision. The headline per-mailbox price roughly doubles once warmup and InfraGuard are on, so compare fully loaded costs against vendors that bundle those in. And the company is young with thin public corporate disclosure, which in a category with this much churn argues for monthly billing and a real placement test before you commit an entire outbound program to it.
Read the full InboxKit profileCheap Inboxes profile last reviewed 2026-09-26; InboxKit last reviewed 2026-09-01. Pricing is compiled from public sources and can change without notice. See our methodology.
The best in Cold Email Infrastructure
15 trackedCold email infrastructure providers supply the sending layer underneath an outbound campaign: they register secondary domains, provision Google Workspace, Microsoft 365, or private mailboxes in bulk, write the SPF, DKIM, and DMARC records automatically, and hand the credentials to whichever sequencer you already use.
Official Google, Microsoft, and Azure mailboxes at the lowest published price in the category, with automated DNS, InfraGuard monitoring, and more than twenty sequencer integrations behind them.
Ten minutes of setup, mailboxes live inside two hours with SPF, DKIM, and DMARC already written, and a one-click push into the sequencer, with no sales call at any tier.
Pre-warmed Google and Microsoft mailboxes and a reported one million inboxes across 50,000 businesses by 2026 make Zapmail the category's fastest riser.
Bulk domain and mailbox provisioning with the DNS done automatically collapsed a week of deliverability setup into a checkout flow, and defined how this category now works.
Mailboxes from forty-nine cents with placement testing, IP rotation, an API, and an MCP server included rather than gated, the strongest capability-per-dollar in the category.
Frequently asked questions
6 questionsWhat is the difference between Cheap Inboxes and InboxKit?
InboxKit starts around $2.50 per mailbox on annual billing, adds Azure tenants as a flat-rate volume option, and ships an MCP server and paid monitoring. Cheap Inboxes is month to month from $3.50, has no Azure option, and competes on workspace isolation, automatic reconnection, and round-the-clock human support. Choose InboxKit for the lowest unit cost at scale with a commitment, Cheap Inboxes for monthly flexibility and support.
Is Cheap Inboxes or InboxKit cheaper?
Cheap Inboxes starts at $3.50 per mailbox per month (free trial). InboxKit starts at About $2.50 per mailbox per month on annual billing. The billing models differ, so the entry price is rarely the whole cost. Cheap Inboxes pricing model: Per mailbox per month on published volume bands, identical for Google and Microsoft, with domains sold separately per year and no setup fee. InboxKit pricing model: Pay-as-you-go against a wallet balance, priced per mailbox per month for Google and Microsoft accounts and per tenant for Azure, with warmup and InfraGuard monitoring as separate add-ons and domains billed separately.
Does Cheap Inboxes or InboxKit have a free plan?
Cheap Inboxes has no free plan. Trial terms: None published. InboxKit has no free plan.
Who should choose Cheap Inboxes?
Agencies and outbound teams that want real Google or Microsoft mailboxes at a published per-mailbox rate without a bundle to buy into, isolated one domain per workspace, and support that answers at 2 a.m. when a client's campaign goes dark.
Who should choose InboxKit?
Outbound teams and agencies that want genuine Google, Microsoft, or Azure mailboxes rather than private SMTP, published per-mailbox pricing rather than a sales call, and the ability to provision, monitor, and retire infrastructure programmatically from an API, a script, or an AI assistant instead of a support channel.
What are the best alternatives to Cheap Inboxes and InboxKit?
SaaSTracker profiles 15 products in Cold Email Infrastructure. The Summer 2026 awards in the category went to Zapmail (Momentum), Mailforge (Innovation), Maildoso (Best Value). Every profile is compiled from primary sources, so a shortlist can be built from pricing, limitations, and fit rather than from star ratings.
