---
title: "InboxKit Pricing Breakdown (2026)"
description: "InboxKit pricing explained: plans from $39/mo (10 mailboxes included), Enterprise from $2.50/mailbox. Full cost calculator and comparison with competitors."
canonical: "https://www.inboxkit.com/learn/inboxkit-pricing"
author: "Mohit Mimani"
published: "2026-03-30"
updated: "2026-03-30"
category: "Pricing"
---

# InboxKit Pricing: Complete Breakdown and Calculator (2026)

InboxKit offers tiered plans starting at $39/mo for 10 mailboxes, with per-mailbox rates from $2.50 on Enterprise. Warmup available as a $3/mailbox/mo add-on, and InfraGuard monitoring included. Here is the complete cost breakdown.

## InboxKit Pricing Overview

InboxKit uses a **tiered subscription model** with three plans designed for different scales:

| Plan | Monthly Price | Included Mailbox Slots | Additional Mailbox Cost |
|---|---|---|---|
| **Professional** | **$39/mo** | 10 mailboxes | $3.50/mailbox |
| **Agency** | **$99/mo** | 30 mailboxes | $3.25/mailbox |
| **Enterprise** | **$299/mo** | 100 mailboxes | $2.50/mailbox |

Annual billing is cheaper (e.g., Enterprise annual: $250/mo, $2.50/additional mailbox). There are no hidden platform fees beyond the plan price.

This is fundamentally different from competitors like Primeforge ($29/mo platform fee) or Instantly ($30-97/mo platform fee) that charge you before you even create a single mailbox.

## Core Pricing Breakdown

Here is the complete pricing table:

| Plan | Monthly Price | Included Mailboxes | Per Additional Mailbox |
|---|---|---|---|
| **Professional** | **$39/mo** | 10 slots | **$3.50/mailbox** |
| **Agency** | **$99/mo** | 30 slots | **$3.25/mailbox** |
| **Enterprise** | **$299/mo** | 100 slots | **$2.50/mailbox** |

| Add-On / Service | Price | Notes |
|---|---|---|
| Warmup | **$3.00/mailbox/mo** | Isolated warmup network |
| Azure Domain | **$30/domain** | Up to 100 mailboxes per domain |
| Domain Registration | From **$2/year** | DNS auto-configured |
| InfraGuard Monitoring | Per-domain pricing | Blacklists, DNS, reputation, auto-pause |
| Inbox Placement Tests | Per-test from wallet | Seed-based testing |

All plans support both Google Workspace (US-IP) and Microsoft 365 mailboxes. Annual billing reduces costs further (e.g., Enterprise annual: $250/mo, $2.50/additional). As shown on the InboxKit pricing page (see screenshot above), everything is transparent. There are no hidden fees beyond the plan price, no overage charges, and no annual lock-in.

## Cost Calculator: Common Setups

| Setup | Plan | Mailboxes | Plan + Additional | Warmup ($3/ea) | Monthly Total |
|---|---|---|---|---|---|
| Starter | Professional $39/mo | 10 | $39 (all included) | $30 | **$69/mo** |
| Growth | Agency $99/mo | 25 | $99 (all included) | $75 | **$174/mo** |
| Scale | Agency $99/mo | 50 | $99 + 20 extra x $3.25 = **$164** | $150 | **$314/mo** |
| Agency | Enterprise $299/mo | 100 | $299 (all included) | $300 | **$599/mo** |
| Large | Enterprise $299/mo | 200 | $299 + 100 extra x $2.50 = **$598** | $600 | **$1,198/mo** |

**Mixed provider example (200 mailboxes with warmup):**
- Enterprise plan: **$299/mo** (includes 100 mailboxes)
- 100 additional mailboxes: 100 x $2.50 = **$299**
- Warmup: $3.00 x 200 = **$600.00**
- **Total: $1,198/mo** (before domains and InfraGuard)

Both Google Workspace and Microsoft 365 mailboxes count toward plan slots. Domain registration, InfraGuard monitoring, and inbox placement tests are additional costs. DNS automation and 24+ sequencer integrations are included.

## InboxKit vs Competitor Pricing

**50 Mailbox cost comparison (monthly):**

| Provider | Plan / Pricing | 50 Mailbox Total | Notes |
|---|---|---|---|
| **InboxKit** | Agency $99/mo (30 incl.) + 20 x $3.25 | **$164/mo** | Google + Microsoft, InfraGuard included |
| **ZapMail** | Growth $99/mo (30 incl.) + 20 x $3.25 | **$164/mo** | Google + Microsoft 365, no monitoring, no Azure |
| Maildoso | ~$2.50/mailbox flat | **~$125/mo** | Shared infrastructure |
| Primeforge | $3.50-4.50/mailbox | **$175-225+** | Varies by plan |
| Instantly | ~$4.00/mailbox + platform | **$230-297** | $30-97/mo platform fee |

InboxKit and ZapMail have nearly identical plan structures and pricing. The differentiation is in infrastructure quality, not price.

**What is included vs. extra:**

| Feature | InboxKit | ZapMail | Primeforge | Mailforge |
|---|---|---|---|---|
| Microsoft 365 | Yes | Yes | Yes | No |
| Azure Mailboxes | Yes ($30/tenant, 100 mailboxes) | No | No | No |
| Warmup | $3/mailbox/mo (isolated) | Pre-warmed option ($6-8/mailbox premium) | Warmforge $2/mailbox | Warmforge $2/mailbox |
| Monitoring | InfraGuard (per-domain) | None | Infraforge $1.50/mailbox | Infraforge $1.50/mailbox |
| Inbox Testing | Wallet-based | None | None | None |
| DNS Automation | Included | Semi-automated | Partial | None |
| Integrations | 24+ sequencers | 5 | 4 | 3 |

## Hidden Cost Comparison

Most competitors advertise a per-mailbox price but require additional paid services:

**ZapMail hidden costs:** Pre-warmed mailboxes at $6-8/mailbox premium, inbox testing (third-party $50-150/mo), monitoring (manual 4-5 hrs/week)

**Primeforge hidden costs:** Warmforge ($2/mailbox/mo), Infraforge ($1.50/mailbox/mo), inbox testing (third-party), monitoring (manual)

**Mailforge hidden costs:** Warmforge ($2/mailbox/mo), Infraforge ($1.50/mailbox/mo), SSL ($0.50/domain/mo), domain masking ($1/domain/mo)

**InboxKit additional costs:** Warmup at **$3.00/mailbox/mo** and InfraGuard at per-domain pricing are on top of your plan price. However, they are native to the platform. no third-party tools needed. DNS automation, inbox placement testing (wallet-based), and 24+ sequencer integrations are included in all plans.

## ROI Analysis

**The real question is cost per email delivered to inbox.**

With InboxKit Enterprise plan (100 mailboxes) plus warmup:
- 100 mailboxes sending 40 emails/day = 4,000 emails/day
- 82% inbox rate = 3,280 inbox deliveries/day
- Enterprise plan: **$299/mo** (100 mailboxes included)
- Monthly warmup cost: $3.00 x 100 = **$300**
- Total: **$599/mo** (before InfraGuard)
- Cost per inbox delivery: $599 / (3,280 x 30) = **$0.0061**

With a competitor at similar pricing but shared warmup and 75% inbox rate:
- Same volume: 3,000 inbox deliveries/day
- Monthly cost: ~**$500**
- Cost per inbox delivery: $500 / (3,000 x 30) = **$0.0056**

The per-delivery costs are in a similar range. InboxKit's advantage is the isolated warmup quality (which produces higher inbox placement) and InfraGuard monitoring (which catches issues before they tank deliverability). For teams where every percentage point of inbox placement matters, InboxKit's total value proposition is stronger.

## Getting Started

1. **Create your account** at inboxkit.com
2. **Choose a plan** (Professional $39/mo, Agency $99/mo, or Enterprise $299/mo)
3. **Buy domains** and create mailboxes within your plan slots
4. **Activate warmup** (**$3.00/mailbox/mo**) and InfraGuard (per-domain pricing)
5. **Start sending** after 14-21 days of warmup

No contracts, no hidden fees beyond the plan price. Scale up or down anytime by upgrading plans or adding mailboxes.

## Frequently asked questions

### Does InboxKit have a monthly platform fee?

InboxKit uses tiered subscription plans starting at $39/mo (Professional). The plan price includes your mailbox slots. there are no hidden platform fees on top of the plan price. You only pay for your plan, any additional mailboxes beyond included slots, and optional add-ons like warmup.

### What is the cheapest per-mailbox pricing on InboxKit?

The Enterprise plan ($299/mo) includes 100 mailboxes with additional mailboxes at $2.50 each. On annual billing, Enterprise drops to $250/mo with $2.50/additional mailbox. The Professional plan starts at $39/mo for 10 mailboxes.

### Is warmup included in InboxKit pricing?

No. Warmup is a separate add-on at $3.00/mailbox/mo. The plan price covers your mailbox slots. Warmup uses an isolated network for higher quality results compared to shared pools used by competitors.

### How does InboxKit compare to buying Google Workspace directly?

Google Workspace direct costs $7.20/month per user, and you handle DNS setup, warmup, and monitoring yourself. InboxKit plans start at $39/mo for 10 mailboxes (effectively $3.90/mailbox at the Professional tier, down to $2.50/mailbox on Enterprise), with automated DNS and warmup available at $3/mailbox/mo as an add-on.

## Sources

- [InboxKit Pricing Page](https://www.inboxkit.com/pricing) (2026)
- [InboxKit Pricing Docs](https://www.inboxkit.com/#pricing) (2026)
- [Google Workspace Pricing](https://workspace.google.com/pricing) (2026)

## Related

- https://www.inboxkit.com/learn/what-is-inboxkit
- https://www.inboxkit.com/learn/inboxkit-review
- https://www.inboxkit.com/learn/zapmail-pricing