InboxKit vs Mailpool
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 assessedInboxKit compared with Mailpool
Mailpool is an alternative for teams that want SMTP inboxes and a dedicated IP option alongside Google and Microsoft mailboxes in one account, with no minimum and a deliverability audit included, at $4 per Google inbox monthly or $3.40 annually. InboxKit remains cheaper for pure Google and Microsoft volume from about $2.50 annually, and adds Azure tenants and an MCP server.
Mailpool compared with InboxKit
Both sell genuine Google and Microsoft mailboxes with automatic DNS and an API. InboxKit starts at about $2.50 per mailbox on annual billing, adds Azure tenants for cheap Microsoft volume, an MCP server, and a paid monitoring add-on, and exports to more than twenty sequencers. Mailpool charges $3.40 annually or $4 monthly for Google, adds its own SMTP inboxes and a dedicated IP option, and includes a deliverability audit and blacklist monitoring. InboxKit is cheaper for pure Google and Microsoft volume; Mailpool is the better fit for a team that wants SMTP inboxes alongside them.
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.
Choose Mailpool if
Small outbound teams and agencies that want to mix Google, Microsoft, and cheaper SMTP inboxes under one account, buy them one at a time with no minimum, and handle domains, DNS, and sequencer export themselves without a sales call.
Side by side
13 attributes| Attribute | InboxKit | Mailpool |
|---|---|---|
| Category | Infrastructure | Infrastructure |
| Starting price | About $2.50 per mailbox per month on annual billing | $3 per SMTP inbox per month, $4 per Google Workspace inbox, $5 per Microsoft 365 inbox, billed monthly; $2.60, $3.40, and $4.30 on annual billing (free trial) |
| 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. | Per-inbox subscription by mailbox type, billed monthly or annually, with automatic volume discounts, a per-server price for a dedicated IP, and custom pricing for dedicated infrastructure. Domains are purchased separately. |
| Free plan | No | No |
| Free trial | No | None; the vendor suggests buying a single $3 inbox to evaluate the platform |
| Best for | 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. | Small outbound teams and agencies that want to mix Google, Microsoft, and cheaper SMTP inboxes under one account, buy them one at a time with no minimum, and handle domains, DNS, and sequencer export themselves without a sales call. |
| Setup time | 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. | The vendor says SMTP and Google inboxes can be created in seconds and a batch of SMTP accounts across domains in under five minutes, while Microsoft 365 inboxes are ready within a few hours. DNS propagation and warmup still need time before full volume. |
| Learning curve | 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. | Low. Buying domains, creating inboxes, and exporting them are guided steps in the dashboard; choosing the right mix of mailbox types is the main decision. |
| Platforms | Web app, REST API, Webhooks, MCP server, Provider admin panels for Google, Microsoft, and Azure | Web app, API, OAuth and CSV export to sequencers |
| Compliance | 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 | SPF, DKIM, and DMARC configured automatically, Operated by Snowlight Ventures OÜ under Estonian law; terms reference the GDPR, ePrivacy Directive, and CAN-SPAM as customer obligations, No compliance certifications published, The pricing comparison lists end-to-end encryption, automated backup, and SSO and SAML without specifying which plans include them |
| Founded | 2024 | 2024 |
| Headquarters | Dubai, United Arab Emirates | Tallinn, Estonia |
| Ownership | Privately held | Privately held (Snowlight Ventures OÜ, trading as Mailpool) |
Strengths and limitations
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.
Mailpool
Strengths
- Google Workspace, Microsoft 365, and SMTP inboxes in one dashboard, with separate infrastructure for each.
- No minimum purchase: a single inbox can be bought for $3, month to month.
- Published per-inbox prices on both monthly and annual billing.
- AI domain generator, bulk domain purchase, and automated SPF, DKIM, DMARC, forwarding, and tracking domain setup.
Limitations
- Domain prices are not published.
- Google inbox pricing reflects a first-year discount and rises to an unpublished renewal rate after twelve months, according to the terms.
- No free trial and no refunds outside what consumer law requires.
- API documentation is only available on request.
Pricing compared
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.
Mailpool
Per-inbox subscription by mailbox type, billed monthly or annually, with automatic volume discounts, a per-server price for a dedicated IP, and custom pricing for dedicated infrastructure. Domains are purchased separately.
- Mailpool (SMTP)$3
- Google Workspace$4
- Microsoft 365 Outlook$5
- Dedicated IP$200
- Dedicated InfrastructureCustom
Mailpool's appeal is flexibility at a fair price rather than the lowest price. Google inboxes at $4 monthly or $3.40 annually sit in the same band as Cheap Inboxes, Premium Inboxes, and InboxKit, and Microsoft at $5 or $4.30 is in line with the market, while SMTP at $3 is more expensive than SMTP specialists such as Maildoso or Winnr, which fall well below $2 at volume. For 10,000 cold emails a month at around thirty sends a day per inbox, about fifteen Google inboxes cost $60 a month or $51 annually, before domains. What Mailpool gives you for that is a single account where all three mailbox types, a dedicated IP, workspaces, and an API live together, and the ability to buy one inbox at a time. The two gaps in the bill are real: domain prices are not published, and the terms say Google pricing moves to renewal rates after year one, so budget for a higher year-two cost on Google inboxes.
Editorial verdict on each
InboxKit
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 profileMailpool
Mailpool is a sensible choice for a small team that does not want to pick one kind of mailbox. Google, Microsoft, and SMTP inboxes live in one dashboard, a single inbox can be bought for $3 with no bundle or minimum, and the domain generator, automatic DNS, deliverability audit, client workspaces, and API cover the rest of the setup without a sales call. Its prices are fair rather than the lowest: SMTP specialists undercut it on SMTP and InboxKit undercuts it on Google at annual rates. The bigger caution is what is missing from the price list. Domain prices are not published, the terms say Google inboxes move to an unpublished renewal rate after the first year, the API documentation is on request, and some pricing details differ between pages. Teams that want flexibility and to start small should try it with a few inboxes; teams buying hundreds of Google seats should compare the year-two cost first.
Read the full Mailpool profileInboxKit profile last reviewed 2026-09-01; Mailpool last reviewed 2026-09-26. 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 InboxKit and Mailpool?
Mailpool is an alternative for teams that want SMTP inboxes and a dedicated IP option alongside Google and Microsoft mailboxes in one account, with no minimum and a deliverability audit included, at $4 per Google inbox monthly or $3.40 annually. InboxKit remains cheaper for pure Google and Microsoft volume from about $2.50 annually, and adds Azure tenants and an MCP server.
Is InboxKit or Mailpool cheaper?
InboxKit starts at About $2.50 per mailbox per month on annual billing. Mailpool starts at $3 per SMTP inbox per month, $4 per Google Workspace inbox, $5 per Microsoft 365 inbox, billed monthly; $2.60, $3.40, and $4.30 on annual billing (free trial). The billing models differ, so the entry price is rarely the whole cost. 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. Mailpool pricing model: Per-inbox subscription by mailbox type, billed monthly or annually, with automatic volume discounts, a per-server price for a dedicated IP, and custom pricing for dedicated infrastructure. Domains are purchased separately.
Does InboxKit or Mailpool have a free plan?
InboxKit has no free plan. Mailpool has no free plan. Trial terms: None; the vendor suggests buying a single $3 inbox to evaluate the platform.
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.
Who should choose Mailpool?
Small outbound teams and agencies that want to mix Google, Microsoft, and cheaper SMTP inboxes under one account, buy them one at a time with no minimum, and handle domains, DNS, and sequencer export themselves without a sales call.
What are the best alternatives to InboxKit and Mailpool?
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.
