InboxKit
A US-IP mailbox provisioning service offering Google Workspace, Microsoft 365, and Azure accounts with automated DNS setup, sold in bundle tiers starting at 10 mailboxes, with warmup and monitoring available as paid add-ons.
Pricing breakdown
| Platform | Standard | Warmed | Volume |
|---|---|---|---|
| Google Workspace | $3.90 | — | — |
| Microsoft 365 | $3.90 | — | — |
| Azure tenant | $3.90 | — | — |
Pricing notes
$39/mo for 10 mailboxes
Replacements
InfraGuard monitoring
Our take on InboxKit
InboxKit's strength is breadth and automation: Google Workspace, Microsoft 365 and Azure mailboxes on US IPs, sold in capacity bundles from ten slots, with a full REST API and webhooks on every plan. At the Enterprise tier the per-mailbox rate drops to roughly $2.99, making it a reasonable multi-platform choice for teams that script their provisioning.
The details matter. Warmup is a distinct $3/mailbox line item, so the base price is cold inboxes only, and the underlying IPs are shared rather than dedicated. Several reviewers note the Azure tenant option can degrade faster than the others, so treat that inbox type with extra care. It's also a relatively young provider — around 37 G2 reviews, self-reported deliverability figures, and no refund policy — so validate placement on a small order first.
What we like
- +Google Workspace, Microsoft 365 and Azure with US IPs
- +Full REST API + webhooks on all plans
- +Bundle pricing down to ~$2.99/mailbox at scale
- +Fast automated setup (30–120 min)
Watch out for
- −Warmup is a separate ~$3/mailbox add-on
- −Base IPs are shared, not dedicated
- −Azure-tenant mailboxes reported to degrade faster than GWS/M365
- −Newer provider with limited reviews and no refund policy
Best for: Automation-minded teams that want multi-platform inboxes and a real API, and will pay separately for warmup.