InboxKit review: flexible Google and Microsoft mailboxes, with warm-up and sending billed on top

InboxKit is a good way to buy one or a thousand Google Workspace or Microsoft 365 mailboxes without a plan or a minimum. The headline $2.50 is the annual rate; month to month it is $3, warm-up is another $3 per mailbox, and you still need a sequencer.

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  • Warm-up and sending included
  • $2.50 a mailbox, 12 minimum
  • Month-to-month billing

InboxKit at a glance

Price per mailbox
from $2.50 (annual billing); $3 monthly
Smallest order
None; one mailbox
Mailbox types
Google, Microsoft
Warm-up
Isolated Warmup add-on, $3 a mailbox a month
MCP server
None found on the site or in the API docs

Who InboxKit fits

Pick InboxKit if

  • You need Google Workspace or Microsoft 365 mailboxes specifically
  • You want no minimum and per-mailbox renewal dates
  • You can commit to annual billing to reach $2.50
  • You automate provisioning through an API with webhooks

Look elsewhere if

  • You want warm-up inside the mailbox price
  • You want a discount for volume on monthly billing
  • You may need a refund after topping up the wallet
  • You want an MCP server for an AI assistant

What InboxKit is

InboxKit sells mailboxes on your own domains: Google Workspace on US IPs, Microsoft 365, and Microsoft mailboxes hosted in an Azure tenant. Every domain gets its own admin panel, DNS is set automatically, and the mailboxes are pushed to one of 24+ sending tools through an integration or an app password.

Billing works from a prepaid wallet. There are no plans or slots: each mailbox renews on its own date and draws from the balance. That suits agencies that add and drop clients every week, and it is why InboxKit has no minimum order.

The company behind it, Enrich Labs in Dubai, also runs SendKit, a sequencer, and Enrich, a contact database. InboxKit itself stops at the mailbox: it does not send campaigns.

Google Workspace, Microsoft 365 and Azure mailboxes on your domains, paid per mailbox from a prepaid wallet and exported to 24+ sequencers source (opens the vendor's page in a new tab) Enrich Labs FZ L.L.C., Dubai, founded 2023; sister products SendKit (sequencer) and Enrich (contact data) source (opens the vendor's page in a new tab)

InboxKit pricing

InboxKit plans and prices
PlanPriceMailboxesPer mailboxBillingIncludes
Google Workspace or Microsoft 365$3.00 a monthper mailbox, from 1$3.00monthlyAutomated DNS, an admin panel per domain, API with webhooks source (opens the vendor's page in a new tab)
Google Workspace or Microsoft 365$2.70 a monthper mailbox$2.70quarterlyBilled upfront for the quarter source (opens the vendor's page in a new tab)
Google Workspace or Microsoft 365$2.50 a monthper mailbox$2.50annualBilled yearly from the wallet source (opens the vendor's page in a new tab)
Azure tenant$30 a monthup to 100 per tenant$0.30 at 100monthlyAzure-hosted Microsoft mailboxes source (opens the vendor's page in a new tab)
Isolated Warmup$3 a mailbox a monthper mailbox$3.00monthlyRamps from 2 to 40 emails a day source (opens the vendor's page in a new tab)

List prices from InboxKit's pricing page, checked . Taxes and card fees excluded.

The mailbox price depends only on the billing cycle: $3.00 monthly, $2.70 quarterly, $2.50 on annual. Volume does not lower it, which is unusual in this market; at 1,000 mailboxes you pay the same rate as at 10.

The add-ons are where the bill grows. Isolated Warmup costs as much as the mailbox, $3 a month, so 100 monthly mailboxes with warm-up come to $600 a month before domains or a sequencer. InfraGuard monitoring is billed per domain at a price InboxKit does not publish, with the first month free.

The Azure tenant is the cheap corner of the price list: $30 a month for up to 100 Microsoft mailboxes, $0.30 each when full. InboxKit's own pages disagree on whether that $30 is per tenant or per domain, so confirm it in the app before you plan around it.

InboxKit limits, setup and terms

Each line links to the vendor's page it comes from.

Other InboxKit features

InfraGuard
Blacklist checks every 6 hours, DNS watch, bounce tracking and placement tests, as an add-on source (opens the vendor's page in a new tab)
Isolation
Every domain gets its own admin panel source (opens the vendor's page in a new tab)
Migration
Assisted migration, usually 24–48 hours source (opens the vendor's page in a new tab)
Team
Unlimited team members and workspaces source (opens the vendor's page in a new tab)
Chargebacks
A chargeback without contacting InboxKit first can lead to suspension and loss of wallet credit source (opens the vendor's page in a new tab)

In detail

What the wallet means for refunds

Money in the wallet is spent, from InboxKit's point of view. The refund policy, in its September 22, 2026 version, makes top-ups, subscriptions and renewals non-refundable, rules out pro-rata refunds and forfeits the balance if you close the account.

The exceptions are narrow and discretionary: duplicate billing, a service that was never delivered, a platform outage over 72 hours. A delivery more than 48 hours late earns pro-rata credit. Top up for a month at a time if you are still testing.

API, integrations and the missing MCP server

The REST API is one of InboxKit's strongest points: orders, workspaces, domain registration, DNS and DMARC, mailboxes, sequencer exports and billing, with webhooks, on every mailbox. Teams that provision mailboxes from their own tooling can automate the whole order.

We found no MCP server in InboxKit's docs on October 8, 2026. If you want an AI assistant such as Claude or ChatGPT to order domains and mailboxes for you, Maildoso, Zapmail, Cheap Inboxes, the Forge products and Outreach2day publish one.

InboxKit ratings

InboxKit's home page cites 4.9 on G2. G2 did not load for us and we found no Trustpilot page for inboxkit.com, so we show no score.

InboxKit or Outreach2day

We sell cold email mailboxes too. Where our product fits this buyer and where it does not.

Outreach2day fits if

  • You run 1,000+ mailboxes: we quote a volume price below every vendor list price in our comparisons, warm-up and sending included
  • SMTP/IMAP mailboxes are enough for your prospects and you want warm-up and sending in one $2.50 line
  • You prefer month-to-month billing at $2.50 with warm-up included
  • You want an AI assistant to run setup through our MCP server

Stay with InboxKit if

  • Your clients require Google Workspace or Microsoft 365 accounts
  • You need fewer than 12 mailboxes
  • You already pay for a sequencer and only want the mailbox line

InboxKit review: questions

How much does InboxKit cost per mailbox?

$3.00 a month on monthly billing, $2.70 on quarterly and $2.50 on annual, the same for Google Workspace and Microsoft 365. Warm-up is an extra $3 per mailbox a month.

Does InboxKit include warm-up?

No. Isolated Warmup is an add-on at $3 per mailbox a month that ramps from 2 to 40 emails a day.

Does InboxKit have a minimum order?

No. You can buy a single mailbox; each mailbox renews on its own date from a prepaid wallet.

Can I get a refund from InboxKit?

Rarely. Wallet top-ups and renewals are non-refundable and unused balance is lost on closing the account. InboxKit makes discretionary exceptions for duplicate billing, non-delivery and outages over 72 hours.

Does InboxKit have an API or MCP server?

It has a REST API with webhooks on every mailbox. We found no MCP server on its site or in its docs.

What rating does InboxKit have?

Its home page cites 4.9 on G2. We could not load G2 to check it and found no Trustpilot page for inboxkit.com.

Deliverability call

Talk to our deliverability team

Book a call with the people who run our mailbox infrastructure. We look at your current setup and tell you what to change. Running 1,000+ mailboxes? We also quote a volume price below every vendor list price in our comparisons, warm-up and sending included.

  • Review your domains, DNS records and current inbox placement
  • Size the setup: domains, mailboxes per domain and daily volume per mailbox
  • Plan warm-up and the move from your current provider or sequencer
  • 1,000+ mailboxes: a volume price per mailbox for your setup

Free call

See open times in your time zone and book on this page.

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More on InboxKit

Sources

Each vendor's own pages. Vendors change prices and plans; if something here is out of date, write to support@outreach2day.com and we will fix it.

First cold emails on day 14, full volume on day 21

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