The Inboxkit Insider’s Guide
Everything we know about Inboxkit in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Inboxkit
The Insider’s Guide
Google and Microsoft mailboxes for cold email, priced per mailbox
Every plan, grade, refund rule and rival among cold outreach tools, read from Inboxkit’s own pages.
Made by Inboxkit · checked Nov 12, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Inboxkit’s own pages, its app-store listings and our grades. Every fact in it is on Inboxkit’s page too, where it is kept up to date. Checked Nov 12, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
1.8
GPA, above 5 of the 47 other cold outreach tools we grade
Inboxkit sells Google Workspace, Microsoft 365 and Azure mailboxes set up for outreach, with DNS records configured automatically and an admin panel for each domain. It is email infrastructure that connects to sequencers rather than a sending tool. There are no plans or minimums; each mailbox is charged on its own renewal date from a prepaid wallet.
To get you started, here are 8 things to know about Inboxkit, taken from its own pages and our grades.
DNS is automated, but you still connect mailboxes to another tool.
- 1
Best for Google and Microsoft mailboxes for cold email
It isn't a sending tool, there is no trial, and warmup and InfraGuard are paid add-ons with no rates shown.
- 2
Paid plans start at $2.50 a month
As its pricing page puts it: $2.50 per mailbox / month, billed yearly ($3 billed monthly).
- 3
It runs on Web
Web.
- 4
Official Google and Microsoft accounts
Mailboxes are real Google Workspace or Microsoft 365 accounts with admin panel access and 2FA for each domain.
- 5
Automated DNS setup
SPF, DKIM and DMARC records are configured for you, and an isolated panel is kept per domain.
- 6
Sequencer connections
The vendor lists 24+ integrations with sequencers such as Instantly, Smartlead and Apollo, plus a full REST API with webhooks.
- 7
A 1.8 GPA, above 5 of 47
That is against the other cold outreach tools we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
To replace Inboxkit you would be making a network of real inboxes that open and answer your emails. That is not a weekend's work, with an AI app builder or without one.
Inboxkit at a glance
- Pricing
- Paid, from $2.50 per mailbox / month, billed yearly ($3 billed monthly)
- Free plan
- No
- Free trial
- None stated
- Runs on
- Web
- Made by
- Inboxkit, since 2023
- Category
- Cold Outreach
- Our grade
- 1.8 GPA, weak
The report card
Best for Google and Microsoft mailboxes for cold email
Inboxkit sells Google Workspace, Microsoft 365 and Azure mailboxes for outreach, with DNS set up for you. Mailboxes are $2.50 each a month on yearly billing. It isn't a sending tool, there is no trial, and warmup and InfraGuard are paid add-ons with no rates shown.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | B | $2.50 a mailbox a month on yearly billing, $3 monthly. Ten mailboxes is $25, in the cheapest quarter ($25). Domains cost extra, from $12.50 each, once. |
| Free plan and trial | F | No free plan and no trial. Each mailbox is charged from the first month, out of a prepaid wallet. |
| Features | D | It supplies mailboxes and DNS, and needs a sequencer like Instantly or Smartlead to do anything. Warmup and InfraGuard are add-ons. |
| Ease of use | C | No store rating on record. DNS is automated, but you still connect mailboxes to another tool. |
| Platforms and integrations | B | Web with an API, plus Instantly, Smartlead, Apollo, Google Workspace and Microsoft 365. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Inboxkit is for
- Fits if you run a sequencer and need a lot of mailboxes fast
- Works for teams who want Google or Microsoft mailboxes, not shared SMTP
Who it is not for
- Skip it if you want a sending tool, since you still need a sequencer
- Not for you if you want a free trial, as there isn't one
- Watch out: warmup and InfraGuard are paid add-ons and their rates aren't shown
- Tight if you can't top up a prepaid wallet by card
Good to know
Good for
- Teams that want real Google or Microsoft mailboxes for outreach
- Agencies that manage many client domains
- Buyers who prefer one flat per-mailbox rate with no base fee
Worth knowing
- Mailboxes are paid from a prepaid wallet topped up by card, with NET-30 invoicing offered only for large volumes.
- Warmup and InfraGuard are paid add-ons; the pricing page does not give their rates.
- There is no free trial: creating an account is free, but each mailbox is charged from the first month.
- The page says there is no promo code; the saving comes from choosing quarterly or annual billing.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$2.50
A month to start
Inboxkit is a paid product, starting at $2.50 per mailbox / month, billed yearly ($3 billed monthly).
Each mailbox is charged from the first month, out of a prepaid wallet.
Google or Microsoft 365 mailbox
$2.50
per mailbox / month, billed yearly ($3 billed monthly)
Same rate at any volume. Includes DNS setup, a domain admin panel, API access and unlimited team members.
Azure tenant
$30
per tenant / month, up to 100 mailboxes
Microsoft 365 mailboxes on Azure; each tenant holds up to 100 mailboxes.
Pre-warmed mailbox
$6
per mailbox / month, domain warmed 2-4 weeks
$7 at 4-8 weeks and $9 at 8+ weeks of warming, billed monthly; each domain also has a one-time fee from $12.50.
Read from inboxkit.com on Nov 12, 2026.
Ways to pay less
Annual discount
Annual billing saves 17%
Inboxkit's pricing page lists $2.50 per mailbox a month on annual billing against $3 monthly, and 10% off quarterly billing.
Stated on inboxkit.com
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Google and Microsoft mailboxes for cold email, priced per mailbox. Here is what it does, as its own site describes it, and what it covers: public API, inbox warm-up, dMARC.
It supplies mailboxes and DNS, and needs a sequencer like Instantly or Smartlead to do anything.
- Official Google and Microsoft accounts
- Mailboxes are real Google Workspace or Microsoft 365 accounts with admin panel access and 2FA for each domain.
- Automated DNS setup
- SPF, DKIM and DMARC records are configured for you, and an isolated panel is kept per domain.
- Sequencer connections
- The vendor lists 24+ integrations with sequencers such as Instantly, Smartlead and Apollo, plus a full REST API with webhooks.
- Mailbox analytics
- Per-mailbox bounce and reply metrics, real-time monitoring and weekly mailbox reports.
- Warmup and InfraGuard add-ons
- Warmup runs on an isolated network, priced per mailbox; InfraGuard watches blacklists and DNS every 6 hours, with the first month free.
- MCP server
- An Inboxkit MCP server lets an AI assistant query mailboxes, domains, DNS and warmup, with hard-to-undo changes waiting for approval.
Where it runs
- Web
What it works with
- Instantly
- Smartlead
- Apollo
- Google Workspace
- Microsoft 365
Inboxkit is made by Inboxkit, and has been around since 2023.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
5/47
Other cold outreach tools it is graded above
Inboxkit's GPA of 1.8 is higher than 5 of the 47 other cold outreach tools we grade, and level with 3.
It stands best on value for money (B, above 29 of 47) and worst on free plan and trial (F, above 0).
Its paid plans start at $2.50 a month, against a middle price of $39 for the category: 0 of the 43 others that charge start lower.
On features, ease of use and platforms it scores 2.0 out of 4, and no tool on the category's chart scores higher without costing more.
Each grade against the category
Every bar is all 48 cold outreach tools we grade, cut by the letter each got. Inboxkit’s own letter is outlined.
- BValue for moneyAbove 29 of 47
- FFree plan and trialAbove 0 of 47
- DFeaturesAbove 0 of 47
- CEase of useAbove 0 of 47
- BPlatforms and integrationsAbove 9 of 47
Price against what you get
Each dot is one of 44 cold outreach tools. Further left costs less; higher up scores better on features, ease of use and platforms. Inboxkit is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
To replace Inboxkit you would be making a network of real inboxes that open and answer your emails. That is not a weekend's work, with an AI app builder or without one.
That makes this kind of software worth paying for, not this one in particular: 39 of the 47 other cold outreach tools grade higher. It costs $30 a year.
What you could not
- A network of real inboxes that open and answer your emails.
- Reading the reports inbox providers send about your domain.
- It plugs into other products, Instantly, Smartlead and Apollo among them, and has an API.
What this rests on. Inboxkit’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Maildoso, Mailforge, Infraforge, Instantly and Smartlead
The 5 tools Inboxkit is most often weighed against, with where each one differs from it.
- 1.4GPA
Maildoso
From $75/mo
Cold email mailboxes and domains sold by the mailbox.
- Inboxkit also covers inbox warm-up.
- 1.6GPA
Mailforge
From $3/mo
Shared-IP domains and mailboxes built for cold email sending.
- 1.6GPA
Infraforge
From $4/mo
- 2.6GPA
Instantly
Free trial · from $37.6/mo
Cold email from unlimited inboxes, priced by emails and contacts.
- Inboxkit also covers inbox warm-up and dMARC.
- Instantly also covers workflow automation, AI agents and email campaigns.
- 2.6GPA
Smartlead
Free trial · from $32/mo
High-volume cold email with unlimited mailboxes and client workspaces.
- Only Smartlead lists iOS and Android apps.
- Inboxkit also covers inbox warm-up and dMARC.
- Smartlead also covers sales pipeline, AI agents and email campaigns.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
14
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Inboxkit free?
No. Inboxkit is a paid product, starting at $2.50 per mailbox / month, billed yearly ($3 billed monthly).
How much does Inboxkit cost?
Inboxkit lists 3 plans. Google or Microsoft 365 mailbox: $2.50 per mailbox / month, billed yearly ($3 billed monthly).
What platforms does Inboxkit work on?
Inboxkit is available on Web.
Does Inboxkit offer any discounts?
Inboxkit publicly lists the following: Annual billing saves 17%.
Does Inboxkit have an Android app?
No Android app was listed when its pages were read on Nov 12, 2026. Inboxkit is listed for Web.
Does Inboxkit have an iPhone app?
No iPhone app was listed when its pages were read on Nov 12, 2026. Inboxkit is listed for Web.
Is Inboxkit open source?
Inboxkit is not described as open source on its own site, as read on Nov 12, 2026.
Does Inboxkit have an API?
Yes. Inboxkit offers a public API, according to its own site.
What does Inboxkit integrate with?
Inboxkit's listing names Instantly, Smartlead, Apollo, Google Workspace and Microsoft 365.
Who makes Inboxkit?
Inboxkit is made by a company of the same name. It dates from 2023.
What are the alternatives to Inboxkit?
The closest alternatives to Inboxkit in our directory are Maildoso, Mailforge, Infraforge, Instantly and Smartlead.
How does Inboxkit compare with other cold outreach tools?
Inboxkit's GPA of 1.8 is higher than 5 of the 47 other cold outreach tools we grade, and level with 3.
Is Inboxkit good value for money?
ToolGPA grades Inboxkit B for value for money. Its paid plans start at $2.50 a month, against a middle price of $39 for the category: 0 of the 43 others that charge start lower.
Could I make my own version of Inboxkit?
To replace Inboxkit you would be making a network of real inboxes that open and answer your emails.
Where this guide comes from
The prices, plans, platforms and features were read from Inboxkit’s own pages on Nov 12, 2026, and the grades were given on Nov 12, 2026. Graded from this listing, whose facts were read from Inboxkit's own pages on 12 November 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Inboxkit. Prices change, so check inboxkit.com before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
5,038
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
5,038
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Inboxkit, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/inboxkit
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Inboxkit: The Insider's Guide", checked Nov 12, 2026. https://toolgpa.com/tools/inboxkit
Know someone choosing between cold outreach tools?
Send them this guide: toolgpa.com/tools/inboxkit/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded cold outreach tools after Inboxkit, each with an Insider's Guide of its own.
- Cold Outreach Insider's GuideEvery one of the 48 cold outreach tools we grade, compared
- lemlist Insider's GuideCold email and LinkedIn sequences with a built-in lead database2.8 GPA
- Salesforge Insider's GuideCold email and LinkedIn sequences with AI-written messages2.8 GPA
- Saleshandy Insider's GuideCold email sequences with a B2B lead database in every plan2.8 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Inboxkit’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Inboxkit is a trademark of its owner, and this guide is not made, paid for or approved by Inboxkit. Prices and plans change: check inboxkit.com before you buy.