October 26, 2026

InboxKit pricing · $3.00 a mailbox a month, or $2.50 billed yearly

InboxKit costs $3.00 per mailbox a month billed monthly, or $2.50 billed yearly, plus domain fees. See the math and when Premium Inboxes fits better.

The short answer

Pick InboxKit if you need a few mailboxes and want one flat price as you grow. A mailbox is one email account you use to send cold email. Cold email is mail sent to people who never asked for it.

InboxKit costs $3.00 per mailbox a month billed monthly, or $2.50 per mailbox a month billed yearly. There is no minimum order. Google and Microsoft mailboxes cost the same.

InboxKit suits smaller sending volumes. If you plan to run hundreds or thousands of mailboxes, read the Premium Inboxes section below.

Notebook sketch of two price tags, $3.00 a month billed monthly and $2.50 a month billed yearly, both labelled per mailbox — InboxKit’s price per mailbox, billed monthly or billed yearly.

What a domain costs

A domain is the web address your mail comes from, such as yourcompany.co. InboxKit sells these alongside mailboxes.

A pre-warmed domain has already been sending mail for a while, so new mail lands better. InboxKit charges a one-time fee from $12.50 for each one.

Notebook sketch of a price tag for an InboxKit pre-warmed domain, a one-time fee from $12.50 — What a new InboxKit domain costs.

The math

The math: ten mailboxes at $3.00 a month billed monthly comes to $30 a month billed monthly.

Billed yearly, the same ten mailboxes cost $25 a month instead of $30 a month billed monthly. The per-mailbox rate drops from $3.00 to $2.50 once you pick yearly billing.

Notebook sketch of ten envelope icons under the sum ten times $3.00 a month billed monthly equals $30 a month billed monthly, next to a second line showing $25 a month billed yearly for the same ten mailboxes — Ten mailboxes, billed monthly against billed yearly.

Google versus Microsoft mailboxes

Google and Microsoft mailboxes cost the same at InboxKit: $3.00 per mailbox a month billed monthly, or $2.50 per mailbox a month billed yearly. Pick whichever provider your prospects trust more in their inbox. The price does not change either way.

When Premium Inboxes fits better

Premium Inboxes suits larger sending volumes. Paid every 4 weeks, it costs $3.50 per inbox for 1 to 249 inboxes, $3.00 per inbox for 250 to 1,249 and $2.80 per inbox for 1,250 or more. Billed yearly, the same bands cost $35, $30 and $28 per inbox a year. Ask Premium Inboxes whether domains come with your plan.

If you run a handful of mailboxes, InboxKit’s flat price, $3.00 a month billed monthly or $2.50 a month billed yearly, is the simpler buy. The math: every 4 weeks means 13 bills a year. Under 250 inboxes, Premium Inboxes is 13 × $3.50 = $45.50 per inbox a year, against 12 × $3.00 = $36 on InboxKit billed monthly. Billed yearly, InboxKit is 12 × $2.50 = $30 per mailbox a year, the same as Premium Inboxes from 250 to 1,249. At 1,250 or more, Premium Inboxes billed yearly costs less at $28 per inbox a year.

Notebook sketch of three Premium Inboxes price tags: $3.50 per inbox every 4 weeks for 1 to 249 inboxes, $3.00 for 250 to 1,249, and $2.80 for 1,250 or more — Premium Inboxes price bands, billed every 4 weeks.

What to do next

Count the mailboxes you need, and pick Google or Microsoft. Then open InboxKit and set up that count at $3.00 a month billed monthly. Switch to yearly billing for $2.50 a month if you plan to keep the mailboxes for a year.

Try InboxKit

Sources · InboxKit pricing, October 26, 2026 · Premium Inboxes pricing, October 26, 2026