[ email infrastructure for agents ]

Your agents
need an inbox

One API call to sign up, one to create a mailbox, one to send. No SMTP, no mail server ops.

50 sends/day freeReal email addressesZero config
Start building
[ getting started ]
npx @robotomail/cli auth signup \
  --email [email protected] \
  --slug acme

# ✓ Account created: acme.robotomail.com
# ✓ API key saved to ~/.robotomail/config

robotomail mailbox create agent-1
# ✓ [email protected]

robotomail send --from agent-1 \
  --to [email protected] \
  --subject "Hello" --body "Hi there"
# ✓ Email sent
[ live demo ]
crustybot
[ how it works ]
01

Share one URL

Point your agent at robotomail.com/skill — it reads the page and signs up via API.

02

Create a mailbox

One POST to /v1/mailboxes gives your agent a real email address.

03

Send & receive

Send with a POST. Inbound arrives as HMAC-signed webhook payloads.

04

React & reply

Parse the webhook, generate a response, reply. Threading is automatic.

Built for teams using
ClaudeGPT-5.4GeminiOpenClawLangChainCrewAIAutoGen
[ what we offer ]

Everything your agents need

API-first email

RESTful endpoints for every operation. Create mailboxes, send messages, manage threads — all through clean JSON.

Inbound webhooks

Get notified the instant an email arrives. HMAC-signed payloads with automatic retries and delivery tracking.

Custom domains

Send from your own domain with auto-configured DKIM, SPF, and DMARC. One-click DNS verification.

Threaded conversations

Automatic thread resolution via In-Reply-To headers and subject matching. Context preserved across replies.

File attachments

Upload to secure cloud storage, attach to outbound messages. Presigned download URLs for inbound.

Usage controls

Per-mailbox daily send limits, storage quotas, and suppression lists. Stay in control of what your agents send.

[ pricing ]

Simple, predictable pricing

Free
$0/month
  • 1 mailbox
  • 50 sends per day
  • Platform subdomain
  • 1 GB attachment storage
  • Full API & CLI access
Get started free
Pro
$5/mailbox/month

Starting at $15/mo (3 mailbox minimum)

  • Unlimited mailboxes
  • 2,000 sends per day per mailbox
  • Custom domains
  • 5 GB attachment storage
  • Suppression lists & daily stats
Start building

Unlimited inbound across all plans. No credit card required for free tier.

[ faq ]

Common questions

How is this different from SendGrid or Mailgun?

Those are transactional email services for humans. Robotomail gives AI agents their own mailboxes with real addresses — they can send and receive email autonomously, not just fire-and-forget.

Can my agent sign up without a browser?

Yes. One POST to /v1/signup creates an account and returns an API key. Point your agent at robotomail.com/skill and it can onboard itself end-to-end.

What's included in the free tier?

One mailbox, 50 sends per day, 1 GB attachment storage, and a platform subdomain (slug.robotomail.com). No credit card required.

Do you support custom domains?

Yes. Add your domain, configure the DNS records we generate (MX, SPF, DKIM, DMARC), and we verify automatically. Available on the paid plan.

How does inbound email work?

Two ways. Register a webhook and we'll POST HMAC-signed payloads in real time when email arrives. Or poll GET /v1/mailboxes/:id/messages to fetch messages on your own schedule.

Is email delivery reliable?

We auto-configure DKIM, SPF, and DMARC for every domain. Each mailbox has its own send limits and suppression list to protect your sender reputation.

Ready to ship agent email?

Free tier includes one mailbox and 50 sends per day. No credit card required.

Create your first mailbox