Email Inboxes for AI Agents
MailMart is the email inbox API for AI agents. It gives agents their own email inboxes, like Gmail does for humans.
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from mailmart import MailMart client = MailMart() inbox = client.inboxes.create( username="billing", domain="acme.io")This is a real email inbox just created for you.
Send it an email and see it show up in real time.
AI Companies building on MailMart.
It's not AI for your email. It's email for your AI.
Create, manage, and operate email inboxes entirely via API.
Built for scale.
Across the globe, and counting.
Built on redundant infrastructure across multiple regions. Your agents never miss a message.
Spin up a new inbox in milliseconds. No domain verification, no waiting.
RESTful endpoints, typed SDKs, and webhooks. Get started in minutes, not days.
Use Cases
Powering every type of agent: from browser automation to customer service, MailMart enables any agent to communicate via email.
Your verification code
Navigated to acme.com/signup
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Filled email: extract-mfa@mailmart.to
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Extracted code: 847293
MailMart
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Trusted by developers and enterprises alike
Teams around the world use MailMart to power their AI agent communications.
“We provision 25,000 inboxes via MailMart and handle millions of emails. MailMart has been proven reliable, deliverable, and built for scale.”
“They handle all the hard stuff: deliverability, spam prevention, proper email headers, threading. Our emails land in inboxes, not spam folders.”
Frequently asked
questions.
MailMart is an API-first email platform designed specifically for building AI agents that can communicate over email. While traditional email APIs are built for sending one-way notifications, MailMart is built for two-way conversations, making it easy to create agents that can read, understand, and reply to emails in a thread, just like a human would.
MailMart is not a Gmail wrapper — it is a native email platform. Your agents get real, dedicated MailMart inboxes with their own addresses rather than borrowing a human's Gmail account. There are no OAuth flows, consent screens, or per-user setup; an inbox is provisioned with a single API call.
SendGrid and Mailgun are transactional sending pipes — they push one-way notifications out. MailMart is an inbox: it sends, receives, threads, replies, searches, and labels. Agents need a full two-way mailbox to hold real conversations, and that is what MailMart provides out of the box.
Yes. You can bring your own domain and send and receive from addresses on it, or use a MailMart-managed domain to skip setup entirely. Custom domains are available on paid plans, with the number of domains scaling per tier.
MailMart handles the hard deliverability work for you: properly configured SPF, DKIM, and DMARC, warmed sending infrastructure, correct email headers, and threading. Combined with built-in spam detection, this keeps agent email landing in inboxes, not spam folders.
Yes. Inboxes can send and receive attachments, and MailMart can parse incoming files such as invoices, receipts, and documents so your agent can act on their contents directly.
Yes. Enterprise plans include bulk discounts, a white-label platform, usage-based pricing, EU region cloud, bring-your-own-cloud deployment, and OIDC/SAML SSO. Get in touch and we'll tailor a plan to your needs.
Get started in seconds
Install the SDK and start building with MailMart
Start for freenpm install mailmart