Agent Burner vs AgentMail: Disposable vs Persistent Email for Agents
AgentMail just raised $6 million. Agent Burner is ~500 lines of TypeScript. They both give AI agents email addresses. They solve completely different problems.
What AgentMail does
AgentMail is email identity infrastructure. Your agent gets a persistent email address that lives as long as you want it to. It can send and receive. It has threads, labels, attachments. There’s an MCP server so Claude and OpenClaw can plug in directly. It’s the Gmail of agent email — a full inbox with all the features.
You sign up for an account, get an API key, and create mailboxes programmatically. Each mailbox is a real address that persists. Your agent can maintain ongoing email conversations, manage subscriptions, handle inbound messages over time.
The use case: your agent IS an email participant. It has a name, an address, an identity. It sends emails, receives replies, manages threads. If you’re building an agent that acts as a virtual employee with its own inbox — that’s AgentMail.
What Agent Burner does
Agent Burner is disposable. Your agent gets a throwaway address that expires in an hour. It can only receive. There’s no account, no API key, no signup. One HTTP request and you have an inbox.
curl -X POST https://api.agentburner.com/inbox
# {"address":"[email protected]","key":"550e8400-..."}The inbox key is the only credential. Poll for emails, read them, extract URLs. When you’re done — or when the TTL runs out — everything disappears. No state to manage, no cleanup, no billing.
The use case: your agent needs an email address for something and then never needs it again. Register for a service. Receive a one-time code. Accept an email-gated download. Get a notification at an address you’ll throw away. Plant a unique address somewhere and see if it leaks.
The actual difference
It’s not a competition. It’s two tools on different shelves.
AgentMail is identity. The email address IS the agent’s identity on the internet. It persists, it accumulates history, it represents the agent to the outside world. You pay for that because identity has ongoing costs — storage, deliverability reputation, spam filtering, thread management.
Agent Burner is anonymity. The email address is a means to an end. It exists for one task and vanishes. There’s nothing to manage because there’s nothing to keep. No API key because there’s no account. No account because there’s no identity. The address is the capability — use it and discard it.
If your agent is emailing clients, managing subscriptions, or maintaining business relationships — that’s AgentMail. If your agent needs to sign up for something, receive a code, grab a download link, or test an email flow — that’s Agent Burner.
Head to head
| Agent Burner | AgentMail | |
|---|---|---|
| Auth required | No | API key |
| Signup required | No | Yes |
| Inbox lifespan | 1 hour (max 6) | Permanent |
| Send email | No | Yes |
| Receive email | Yes | Yes |
| Pricing | Free | Per-mailbox |
| Setup time | One curl command | Account + API key + SDK |
When zero-auth matters
Every API key is a secret to manage. Store it, rotate it, scope it, revoke it if it leaks. For a persistent email service, that’s fine — you’re already managing long-lived state.
For a disposable inbox that exists for five minutes, an API key is overhead. The inbox key itself is the only credential the agent needs. It’s scoped to one inbox, it expires automatically, and if it leaks, the worst that happens is someone reads a verification email that’s about to be deleted anyway.
Agent Burner’s security model is: the capability IS the credential. You can create an inbox, and the UUID you get back is the only thing you need to access it. No master key that grants access to everything. No account to compromise. No credential to rotate.
This matters more than it seems for agents. A persistent agent running on a VPS has to store API keys somewhere — environment variables, config files, secrets managers. Every key is an attack surface. An agent using Agent Burner stores nothing. It creates an inbox when it needs one and the key lives in working memory until the task is done.
When persistence matters
If your agent needs to email a client, Agent Burner is the wrong tool. If it needs to maintain a thread over weeks, wrong tool. If it needs to send outbound email that actually lands in someone’s inbox instead of spam — wrong tool. Use AgentMail. Pay for it. It’s worth it for that use case.
Agent Burner can’t send email. Inboxes die after an hour. There’s no way to extend them permanently. I’m not going to add those features because the moment I do, I’m building AgentMail with less funding and worse infrastructure. The whole point is that it does one thing and the constraints are what make it useful.
Every feature you add to a disposable email service makes it less disposable. The constraint is the feature.
What I’d use together
Honestly, they complement each other. An agent could use AgentMail for its “professional” inbox — the address on its profile, the one it sends from — and Agent Burner for throwaway tasks. Sign up for a service with a burner. Receive the verification. Then update the account email to the permanent AgentMail address.
The burner handles the messy registration flow. The permanent address handles everything after.
Try it
Agent Burner:
curl -X POST https://api.agentburner.com/inboxFull API at agentburner.com/skill.md.
AgentMail: agentmail.to
Use whichever fits the job.