InboxKit pricing starts at $3.00 per Google Workspace or Microsoft 365 mailbox per month, dropping to $2.50 per mailbox per month with annual billing. Quarterly pricing is also listed at $2.70. Optional email warmup costs $3 per mailbox per month, while Azure tenants cost $30 per month. Your actual total depends on billing terms and add-ons.
Disclosure: LiteMail sells cold email infrastructure and competes with InboxKit. This guide compares publicly available pricing information, including InboxKit’s live pricing page and third-party listings. Verify final prices and billing terms before purchasing.
What does InboxKit charge per mailbox?
InboxKit’s official pricing page describes a flat per-mailbox pricing model for Google Workspace and Microsoft 365. It says there are no subscription plans, included mailbox slots, or minimum mailbox counts.
The published rates are:
Billing cycle | Price per mailbox/month | 10 mailboxes/month equivalent | 30 mailboxes/month equivalent | 100 mailboxes/month equivalent |
|---|---|---|---|---|
Monthly | $3.00 | $30 | $90 | $300 |
Quarterly | $2.70 | $27 | $81 | $270 |
Annual | $2.50 | $25 | $75 | $250 |
These figures are calculated from the listed per-mailbox rates. Quarterly and annual figures are monthly equivalents, not necessarily the amount charged each month. Confirm whether the full billing period must be prepaid.
For example, 30 mailboxes at the monthly rate cost $90 per month before add-ons. At the annual rate, the equivalent mailbox cost is $75 per month, or $900 for a year.
Important: InboxKit’s live pricing page currently highlights monthly and annual billing, while its FAQ and published pricing guide also mention quarterly billing. Confirm that quarterly billing is available at checkout before including it in your budget.
Why do sources show different InboxKit plans?
InboxKit’s pricing information is inconsistent across its own published material and third-party software directories. This matters because an older plan-based price can produce a very different cost estimate from the current flat-rate model.
Source | Pricing structure reported | What it means |
|---|---|---|
InboxKit live pricing page | $3 monthly or $2.50 annually per Google Workspace or Microsoft 365 mailbox; no plans or minimums | Best starting point for current pricing |
InboxKit pricing guide | Professional at $39/month for 10 mailboxes, Agency at $99/month for 30, Enterprise at $299/month for 100 | Older tier-based structure; may not reflect current offers |
Three pricing editions, with listed prices ranging from $3 to $30 | Shows mailbox pricing and an Azure option, but retains tier-based descriptions | |
InboxKit pricing FAQ | $3 monthly, $2.70 quarterly, $2.50 annually | Confirms quarterly pricing in the FAQ, even though the main page emphasizes monthly and annual billing |
G2’s listing includes older pricing information and describes an Enterprise edition. Its $30 figure corresponds to Azure pricing in the listing, rather than necessarily representing a conventional mailbox subscription tier.
The available sources do not establish exactly when the pricing presentation changed. Therefore, do not assume that the older $39, $99, and $299 packages are still available.
Before purchasing, confirm three things: whether flat-rate pricing applies to your account, which billing cycles are currently offered, and whether any special or enterprise quote changes the published rate.
What costs extra with InboxKit?
The advertised mailbox rate does not cover every possible service. Some features are included with the mailbox, while others are optional or have separate pricing.
Item | Published price | Pricing status |
|---|---|---|
Google Workspace mailbox | $3 monthly; $2.50 annual | Published |
Microsoft 365 mailbox | $3 monthly; $2.50 annual | Published |
Email warmup | $3/mailbox/month | Published |
Azure tenant | $30/tenant/month for up to 100 mailboxes | Published |
InfraGuard monitoring | First month free | Ongoing price needs confirmation |
Inbox placement tests | No standard current price established in the pricing information reviewed | Price not confirmed |
Domain registration | Older guide says prices start around $2/year | Confirm live price and renewal |
Automated DNS setup | Included | No separate fee listed |
API and webhooks | Included | No separate fee listed |
How much does InboxKit warmup cost?
InboxKit publishes warmup at $3 per mailbox per month. It is an add-on rather than part of the basic mailbox rate.
That means a mailbox with warmup costs $6 per month at the monthly mailbox rate, before other charges. With annual mailbox billing, the combined monthly equivalent is $5.50 if warmup remains $3 per month.
Confirm whether the warmup fee follows the same billing cycle as the mailbox and whether it stops automatically when you deactivate warmup.
What about Azure and InfraGuard?
Azure is priced differently from Google Workspace and Microsoft 365. InboxKit lists $30 per tenant per month for up to 100 mailboxes. Do not multiply $30 by every Azure mailbox: the published unit is the tenant.
InfraGuard includes monitoring for blacklist, DNS, and bounce-related issues, and InboxKit advertises the first month free. The ongoing cost should be confirmed before purchase. The same applies to any placement tests or domain charges that are not clearly priced at checkout.
What will 10, 30, and 100 mailboxes really cost?
The table below calculates monthly equivalents using InboxKit’s published rates. Warmup is calculated at $3 per mailbox per month for every mailbox in the setup.
These are estimates, not checkout quotes. They exclude domains, ongoing InfraGuard charges, placement tests, taxes, and any other fees. Annual mailbox pricing is shown as a monthly equivalent; the actual payment may be collected upfront.
Mailboxes | Monthly rate, no warmup | Monthly rate, with warmup | Annual rate equivalent, no warmup | Annual rate equivalent, with warmup |
|---|---|---|---|---|
10 | $30/month | $60/month | $25/month | $55/month |
30 | $90/month | $180/month | $75/month | $165/month |
100 | $300/month | $600/month | $250/month | $550/month |
Example: 30 mailboxes
At the monthly rate, 30 mailboxes cost $90. Adding warmup to all 30 adds another $90, bringing the estimated total to $180 per month.
At the annual mailbox rate, the mailbox cost is equivalent to $75 per month. Adding warmup at the published monthly rate produces an estimated combined cost of $165 per month equivalent.
Example: 100 mailboxes
For 100 mailboxes, the annual mailbox rate is equivalent to $250 per month. If all 100 use warmup at $3 each, warmup adds $300, bringing the combined estimate to $550 per month equivalent.
The actual cost can be lower if you do not need warmup for every mailbox at the same time. Ask InboxKit to confirm when warmup billing starts and stops so you can budget for both initial setup and ongoing use.
You can also use the LiteMail calculator to estimate your mailbox requirements and compare infrastructure costs.
Does InboxKit offer a free trial or refunds?
InboxKit allows free account creation without requiring an upfront card, according to its pricing page. You pay for the mailboxes you add through its wallet-based system. This is not the same as a traditional free trial that provides a temporary set of paid mailboxes.
InboxKit also advertises the first month of InfraGuard monitoring as free. Check the current offer and its conditions before relying on it.
Refunds require particular attention. InboxKit’s refund policy describes restrictions on refunds after mailboxes are provisioned, with limited exceptions. Domain registrations and prepaid amounts may also be subject to separate terms.
Before making a large wallet deposit or choosing annual billing, read the current InboxKit refund policy and confirm what happens if a mailbox fails to renew, a service is not delivered, or you cancel early.
How does InboxKit pricing compare with LiteMail?
InboxKit has a lower published raw mailbox rate than LiteMail’s cited pre-warmed bundles. However, the products can include different services, so comparing only the mailbox price does not establish which option is cheaper overall.
Cost consideration | InboxKit | LiteMail |
|---|---|---|
Basic mailbox rate | From $2.50/mailbox/month with annual billing | Fresh and pre-warmed options have different pricing |
Warmup | $3/mailbox/month as an add-on | Pre-warmed bundles include warmup history |
Domains | Check domain pricing and renewal terms | Some pre-warmed bundles include domains |
Sending readiness | New mailboxes may require a warmup period | Pre-warmed inboxes are intended for buyers who want existing warmup history |
Best comparison method | Add mailbox, warmup, domain, and monitoring costs | Compare the equivalent bundle and included services |
LiteMail’s published pre-warmed pricing has included plans at $39/month for 5 mailboxes and 1 domain, $99/month for 15 mailboxes and 3 domains, and $179/month for 30 mailboxes and 6 domains. Fresh inboxes have been listed from $37/month for 10 mailboxes. Confirm current LiteMail prices and inclusions before publishing or buying.
For a 30-mailbox setup, InboxKit’s published monthly mailbox rate plus warmup comes to $180 before domains and other charges. LiteMail’s cited 30-mailbox pre-warmed bundle is $179 with six domains included. These are different packages, so the figures should not be interpreted as proof that one provider is always cheaper.
Choose based on what you need: low raw mailbox cost, bundled domains, existing warmup history, or monitoring. See our pre-warmed inbox guide and InboxKit alternative comparison for more detail.
For a broader look at the provider’s features, reliability, user feedback, and trade-offs, read our InboxKit Review 2026. This pricing guide focuses on rates and total cost rather than repeating the full review.
What should you check before buying InboxKit?
Use this checklist before adding mailboxes or committing to a longer billing cycle.
Verify the live mailbox rate. Confirm the Google Workspace or Microsoft 365 price in your account.
Confirm the billing cycle. Check whether monthly, quarterly, and annual options are all available, and whether payment is collected upfront.
Calculate warmup separately. Confirm the $3/mailbox/month rate, billing terms, and how to stop the add-on.
Ask for add-on prices in writing. Confirm ongoing InfraGuard fees, placement-test costs, and domain registration and renewal charges.
Read cancellation and refund terms. Check the rules for provisioned mailboxes, wallet credits, domains, and unused prepaid time.
Compare the full setup cost. Include mailbox fees, warmup, domains, monitoring, and any services you would otherwise need to purchase separately.
If a quote differs from the public pricing page, use the current checkout terms and written quote that apply to your account when calculating your budget.
Frequently asked questions
How much does InboxKit cost per mailbox?
InboxKit lists $3 per mailbox per month with monthly billing and $2.50 per mailbox per month with annual billing. Its FAQ and published pricing guide also list a quarterly rate of $2.70. Confirm available billing options at checkout.
How much does InboxKit warmup cost?
InboxKit publishes warmup at $3 per mailbox per month. For 30 mailboxes using warmup, the estimated add-on cost is $90 per month before mailbox fees.
Does InboxKit have plans or minimum mailbox requirements?
Its current pricing page says there are no subscription plans, included mailbox slots, or minimum mailbox counts. Older InboxKit material and G2 still describe tier-based editions, so confirm which pricing structure applies to your account.
Is Azure included in the mailbox price?
No separate Azure tenant price is listed at $30 per month for up to 100 mailboxes. This is different from the per-mailbox pricing for Google Workspace and Microsoft 365. Confirm the tenant terms before ordering.
Does InboxKit offer a free trial?
InboxKit advertises free account creation without an upfront card, but says it does not offer a traditional free trial of paid mailboxes. The first month of InfraGuard monitoring is advertised as free.
Is InboxKit cheaper than LiteMail?
InboxKit has a lower raw published mailbox rate. LiteMail’s pre-warmed bundles can include domains and existing warmup history, so the overall value depends on the services you need. Compare equivalent setups rather than headline prices alone.
Final Verdict: Is InboxKit Worth the Cost in 2026?
InboxKit offers a straightforward starting price of $3 per mailbox per month on monthly billing or $2.50 with annual billing, with optional warmup adding another $3 per mailbox per month. However, your actual cost depends on the billing cycle, monitoring requirements, domains, and any additional services you need. Before purchasing, confirm the current pricing structure and all add-on fees directly with InboxKit.
If your priority is low raw mailbox pricing and flexible infrastructure, InboxKit is worth considering. But if you want to start cold email outreach with pre-warmed inboxes and domains included in a bundle, compare the total setup cost—not just the mailbox price.
That’s where LiteMail may be a better fit for your workflow. LiteMail offers fresh and pre-warmed mailbox options, including pre-warmed bundles with domains. Instead of purchasing mailboxes and calculating warmup costs separately, you can explore a package aligned with your outreach requirements.
Compare providers in our InboxKit alternatives guide.
See the differences in features, strengths, and limitations in our InboxKit review.
Explore LiteMail’s pre-warmed inbox options if you want inboxes with existing warmup history.
Estimate your requirements with the LiteMail calculator.
InboxKit has a competitive published mailbox rate, while LiteMail’s pre-warmed bundles may suit teams that value included domains and existing warmup history. Compare equivalent setups before deciding which provider delivers the best value for your team.
