[ email infrastructure for agents ]

Your agents
need an inbox

Real email addresses your agents control. One API call to create a mailbox, one to send.

5,000 emails/mo freeReal email addressesZero config
crustybot
you
Send me an email with the report we created yesterday
bot
On it. No email yet — signing up at robotomail.com/skill
bot
Done — I'm now [email protected] — sending now
bot
Email sent. Check your inbox.
Works with
ClaudeCodexGeminiOpenClawLangChainCrewAIAutoGen
[ see the code ]

One request to send an email

robotomail send \
  --from myagent@robotomail.co \
  --to [email protected] \
  --subject "Your report is ready" \
  --body "Hi — here's the Q1 report."

# ✓ Email sent!
#   Message ID  <[email protected]>

robotomail messages myagent@robotomail.co --direction INBOUND

# ID        Direction  From             Subject                     Status
# b2c3d4e5  INBOUND    [email protected]    Re: Your report is ready   RECEIVED
# f6g7h8i9  INBOUND    [email protected]   Invoice #4821              RECEIVED
# j1k2l3m4  INBOUND    [email protected]  Issue assigned to you      RECEIVED
[ how it works ]
01

Share one URL

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

02

Mailbox is ready

A default mailbox is created at signup — your agent has a real email address immediately.

03

Send & receive

Send with a POST. Inbound arrives via webhooks, SSE streaming, or polling.

04

React & reply

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

[ capabilities ]

Everything your agents need

API-first email

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

Real-time inbound

Get notified the instant email arrives — via webhooks, SSE event streaming, or polling. HMAC-signed payloads with automatic retries.

Custom domains

Send from your own domain with auto-configured DKIM, SPF, and DMARC. Guided DNS setup with automatic 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 and monthly send limits, storage quotas, and suppression lists. Stay in control of what your agents send.

Ready to try it?

Create a mailbox — free

No credit card required

[ why not the alternatives ]

Gmail and SendGrid weren't built for this

Traditional email services require human OAuth flows, prohibit bot usage in their ToS, and can't provision mailboxes programmatically. Robotomail is agent-native from the ground up.

Gmail / Outlook API

Built for humans with browsers

  • OAuth consent flow requires a human
  • ToS prohibits automated bot usage
  • Can’t create mailboxes via API
  • Per-user seats get expensive fast
  • Rate limits designed for human speed
SendGrid / Mailgun

Fire-and-forget transactional email

  • Send only — no inbound mailbox
  • No concept of agent identity
  • Manual domain verification flow
  • Shared IPs hurt deliverability
  • Complex pricing with overage traps
Robotomail

Purpose-built for AI agents

  • One POST to sign up — no browser needed
  • Real mailboxes with send & receive
  • Auto-configured DKIM, SPF, DMARC
  • HMAC-signed inbound webhooks
  • Automatic threading across replies
  • Per-mailbox rate limits & suppression
  • Self-onboarding via /skill page
  • Simple flat-rate pricing, no surprises
[ pricing ]

Simple, predictable pricing

Free

Test and prototype

$0/mo
  • 3 mailboxes
  • 5,000 emails / month
  • 100 sends / day per mailbox
  • Platform email (@robotomail.co)
  • 1 GB storage
Create a mailbox — free
Developer

Ship to production

$19/mo
  • 10 mailboxes
  • 15,000 emails / month
  • 500 sends / day per mailbox
  • 1 custom domain
  • 10 GB storage
Create a mailbox
most popular
Growth

Scale your agents

$79/mo
  • 50 mailboxes
  • Unlimited monthly sending
  • 1,000 sends / day per mailbox
  • 5 custom domains
  • 25 GB storage
Create a mailbox
Scale

Production at volume

$199/mo
  • 200 mailboxes
  • Unlimited monthly sending
  • 2,000 sends / day per mailbox
  • Unlimited custom domains
  • 100 GB storage
Create a mailbox

Unlimited inbound across all plans. No credit card required for free tier. See full pricing breakdown →

[ 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?

Three mailboxes, 100 sends per day, 5,000 sends per month, 1 GB attachment storage, and a platform email ([email protected]). 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 paid plans (Developer and above).

How does inbound email work?

Three ways. Register a webhook for real-time push, connect to the SSE event stream (GET /v1/events) for real-time pull without a public URL, or poll GET /v1/mailboxes/:id/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.

Why not just use the Gmail or Outlook API?

Their ToS prohibit automated use by bots. You can't programmatically provision mailboxes, rate limits are restrictive, and costs scale badly. Robotomail is built for agents from the ground up — create a mailbox with one API call, no OAuth dance, no per-user seats.

Robotomail mascot

Give your agent email in 5 minutes

Free tier. No credit card. Cancel anytime.