InboxKit vs Mailpool

Mailpool charges per inbox each month, with no minimum and no setup fee. Monthly rates are $3 for its own SMTP inboxes, $4 for Google Workspace and $5 for Microsoft 365. A dedicated IP costs $200 a server.

Annual billing saves 15%: $2.60, $3.40 and $4.30, and $170 for a dedicated IP. Mailpool also offers custom volume pricing on request. InboxKit is $3 a Google or Microsoft 365 mailbox, or $2.50 on annual billing.

At list rates, 500 Google and 500 Microsoft 365 inboxes cost $4,500 a month on Mailpool and $3,000 here. On annual billing it is $3,850 against $2,500, at today’s published rate.

Mailpool sells inboxes on its own shared SMTP network, Google Workspace and Microsoft 365 Outlook, plus dedicated-IP servers. Its pages do not mention Azure or Entra.

InboxKit sells official, paid Google Workspace and Microsoft 365 mailboxes at the same $3. Microsoft volume can run on Azure, where one tenant holds up to 100 mailboxes for $30 a month. On Mailpool, 100 Microsoft 365 inboxes cost $500.

Mailpool’s pricing page says you can create hundreds of inboxes in seconds. It says $3 gets you started, covering the setup of a first mailbox.

InboxKit completes orders in 30 to 120 minutes, automatically, with SPF, DKIM and DMARC configured for you. Pre-warmed mailboxes are live in hours. You buy domains or connect your own in one click, and domain rotation and migration are built in.

Mailpool advertises continuous spam-rate and blacklist monitoring, and a deliverability audit with over 250 checks. We found no warmup service or pre-warmed inboxes on its homepage, pricing or product pages.

InboxKit’s warmup is a $3 add-on that runs for 14 days on an isolated network. InfraGuard, also an add-on, checks blacklists, DNS, bounces and inbox placement every six hours. It includes alerts, auto-pause and unlimited placement tests. Its first month is free.

Mailpool includes API access on all plans, with keys in the dashboard. Detailed API docs are available on request through live chat. Its pages mention no MCP server.

Every InboxKit account gets the full REST API, with 119 documented endpoints and webhooks. Connect Claude Code or Codex to InboxKit’s remote MCP server to run your mailbox work from an agent.

InboxKit is rated 4.7 out of 5 on G2 from 120 reviews. G2 named it a High Performer for Spring 2026.

InboxKit support runs 24/7 on Slack, in-app chat and email. Every account gets unlimited team members and workspaces, and mailboxes export in one click to 24+ sequencers.