InboxKit vs Mission Inbox
InboxKit (Google & Microsoft mailboxes) and Mission Inbox (Dedicated-IP outbound mailboxes) are both popular cold email infrastructure picks. For 30 mailboxes on 10 domains, InboxKit is cheaper at $98.72/mo vs $207.72/mo for Mission Inbox, a difference of $109 a month ($1308 a year).
Last updated 2026-11-02 · list prices, monthly billing
Verdict by use case
Side by side
| InboxKit | Mission Inbox | |
|---|---|---|
| Mailbox type | Google/Microsoft reseller | Private SMTP |
| Platform | GoogleMicrosoft | SMTP |
| Per mailbox / month | $3.00 $3.00 monthly, $2.50 on annual billing. Azure: $30/tenant/month (up to 100 mailboxes). | $3.33 Lite: $50/month for 15 mailboxes and 5,000 sends. Scale: $199/month for 30 mailboxes and 10,000 sends. Warmup emails count as sends. |
| 30 mailboxes / month | $90 | $199 |
| + 10 domains / month | $8.72 * | $8.72 * |
| Total / month | $98.72 | $207.72 |
| Minimum | None | 15 mailboxes (Lite) |
| Warmup | Add-on | Unknown |
| Sending cap | None published | 10,000 sends/month on the Scale plan (warmup counts) |
| Price source | Provider page | Provider page |
* Reference .com price used (provider domain price not published).
Frequently asked questions
Is InboxKit cheaper than Mission Inbox?
For 30 mailboxes + 10 domains on monthly list prices, InboxKit is cheaper: $98.72/mo vs $207.72/mo (checked 2026-11-02).
What's the difference between InboxKit and Mission Inbox?
InboxKit: Google & Microsoft mailboxes, $3.00 per mailbox, minimum none, warmup add-on. Mission Inbox: Dedicated-IP outbound mailboxes, $3.33 per mailbox, minimum 15 mailboxes (lite), warmup unknown.
Which is better for cold email, InboxKit or Mission Inbox?
On price, InboxKit wins for a 30-inbox setup. Beyond price, compare platform (Google/Microsoft vs SMTP), minimums and warmup. MailboxWatch doesn't test deliverability.