Pricing

Simple pricing for email that works your way.

Real mailboxes on your own domain. Use them in Webmail, from your applications through the REST API, or with AI assistants through MCP. Every plan includes all three. Start free, and move to Plus when you need more room.

Free

For individuals, developers and smaller applications.

3 mailboxes
3 domains
3 GB of storage
3,000 sent emails a month
Webmail, REST API and MCP

No card needed.

Get started free

Plus

$15/month

For more mailboxes, domains, storage and sending.

10 mailboxes
10 domains
10 GB of storage
10,000 sent emails a month
Webmail, REST API and MCP

Get Plus

Custom solution

Let's talk

Ask for more storage, mailboxes, or your own IP.

Arranged case by case, subject to availability.

Compare plans

Every plan has the same features. Plans differ only in how much they hold and send.

Feature	Free	Plus	Custom solution
Price	$0	$15/month	Let's talk
Mailboxes	3	10	Ask us
Domains (your own)	3	10	Ask us
Storage, shared by all mailboxes	3 GB	10 GB	Ask us
Sent emails a month, per recipient	3,000	10,000	Ask us
Webmail	Included	Included	Included
REST API and webhooks	Included	Included	Included
MCP server for AI assistants	Included	Included	Included
API keys and AI apps with permissions you choose	Included	Included	Included

How the limits work

Sent emails are counted per recipient

A message to three people counts three, Cc and Bcc included. The count covers the whole account and starts again on the first day of each calendar month (UTC). Incoming mail doesn't count, and neither does a send Box refuses. Once Box accepts a message for sending, each recipient counts, even if delivery to them later fails.

Sending also has rate limits

To protect delivery for everyone, sending is also limited per hour and per day, the same on every plan. These limits pace sending; they aren't a separate allowance. The API documentation explains them.

Storage is shared

All of an account's mailboxes share its storage, and drafts count toward it.

Domains count from when you add them

A domain counts toward the limit from when you add it, verified or not, until you delete it. At a mailbox or domain limit, adding another is refused; what you already have keeps working.

Billing and cancelling Plus

Plus is billed monthly through Stripe. Only the account owner, signed in to the Console, can upgrade, cancel or turn renewal back on.

Cancelling stops the next renewal. Plus continues until the end of the period you've paid for, and until then you can turn renewal back on. You can cancel whatever your account uses.

When Plus ends, Free's limits apply. If your account uses more than Free allows, nothing is deleted. New mailboxes, domains and sending stay paused until you remove what's over and finish moving to Free in the Console, or upgrade again.

The Terms of Service set out the full terms of plans, billing and cancellation.

Questions

Do I need my own domain?

Yes. Every mailbox is on a domain you own, and you add the DNS records the Console shows you. Box doesn't offer addresses on a shared domain, or IMAP, POP3 or SMTP access for desktop mail apps.

Can I use Box without an AI assistant?

Yes. Webmail is a complete email client. The REST API and MCP are there when you want them.

Are the REST API and MCP included in Free?

Yes. Free and Plus have the same API operations and MCP tools.

How are monthly emails counted?

By recipient, across the whole account, per calendar month (UTC). The Console warns you as you near the limit, and GET /v1/usage shows how many are left and when the count starts again.

Can I upgrade later?

Yes, at any time, from Subscription in the Console. Your mailboxes and mail stay as they are.

What happens if I cancel Plus?

You keep Plus until the end of the period you've paid for, then Free's limits apply. Until then you can turn renewal back on.

What if my account uses more than its plan allows?

Nothing is deleted. At a mailbox or domain limit, adding another is refused. If your mail takes up more storage than your plan allows, sending stops and incoming email may be deferred for a while: the sender's mail server holds it and tries again later. Permanently deleting mail, emptying Trash or upgrading makes room. After Plus ends, an account over Free's limits also can't add mailboxes or domains, or send, until you remove what's over and finish moving to Free, or upgrade again.

Can I get more storage, more mailboxes or my own IP?

and tell us what you need. Custom solutions are arranged case by case, subject to availability.