Simple Pricing

Email infrastructure
for every scale.

Start free. Upgrade when you need more inboxes or volume. No hidden fees — inbound emails are always included.

[ Free ]

$0/mo

Get started. No credit card required.

  • 3 agent inboxes
  • 500 emails received / month
  • 100 emails sent / month
  • OTP & verification link extraction
  • MCP server access
  • REST API access
Start for free

[ Starter ]

$9/mo

For solo developers running automations.

  • 10 agent inboxes
  • 5,000 emails received / month
  • 2,000 emails sent / month
  • OTP & verification link extraction
  • Webhooks
  • Custom domains (MX, SPF, DKIM)
  • MCP server access
Get started
Most Popular

[ Pro ]

$29/mo

For teams running multiple AI agents.

  • 50 agent inboxes
  • 25,000 emails received / month
  • 10,000 emails sent / month
  • Everything in Starter
  • AI email categorization (BYOK)
  • Thread routing
  • Contact lists & marketing emails
Get started

[ Scale ]

$99/mo

For production AI pipelines at scale.

  • 250 agent inboxes
  • 100,000 emails received / month
  • 50,000 emails sent / month
  • Everything in Pro
  • Priority support
  • SLA guarantee
  • Dedicated deliverability
Get started

Need more? Contact us for enterprise pricing with dedicated infrastructure and SLAs.

Frequently Asked Questions

What counts as an email received?

Any inbound email delivered to an agent inbox — OTPs, verification links, newsletters, replies. Emails that bounce or are rejected before delivery don't count.

Can I create inboxes dynamically via API?

Yes. Your agents can call POST /v1/inboxes at runtime to provision a new email address in milliseconds. The inbox limit applies to concurrently active inboxes, not total ever created.

What happens when I hit my limit?

The API returns a 402 error with a clear message. Inbound emails already in transit will still be delivered. We never silently drop emails — you'll know before anything is lost.

Do you support Bring Your Own Keys (BYOK)?

Yes. Provide your OpenAI, Anthropic, or Google API key and Lumbox uses it for AI email categorization and OTP extraction. Your key is encrypted at rest with AES-256-GCM.

Can I use my own domain for inboxes?

Yes on Starter and above. Add your domain, configure MX/SPF/DKIM records, and your agents get addresses like agent@yourdomain.com.