Choose Postfleet
When email from outside your system can reach a tool-using agent and you want sender-auth visibility, sanitization, spam and malware quarantine, typed extraction, and approval controls enforced before execution.
Comparison — Postfleet vs AgentMail
An inbox for your agent. A trust boundary for its inputs.
AgentMail offers broad email infrastructure. Postfleet is built for teams that need inbound messages authenticated, sanitized, malware- and spam-screened, injection-scanned, and mapped to a JSON schema before they enter agent context.
- Raw email
- Auth + attachments
- Sanitized
- Virus gate
- Spam gate
- Injection scan
- Typed JSON
Choose Based on What Reaches Your Agent
Both products provide programmable inboxes. The practical difference is whether you need broad email access or a controlled path from untrusted messages into agent context.
Choose AgentMail
When access breadth matters most — SOC 2, IMAP / SMTP, official SDKs, multi-tenant pods, or dedicated IPs — and your team will build its own message-processing layer.
LobsterMail scores a message and continues: safeBodyForLLM is a convenience, and the raw body is still available. We skip extraction on injection-risk. Different product.
Want to keep the inbox you already have, or take 30 days of Pro if you are leaving AgentMail? Keep your inbox, or switch.
Still deciding whether you need a dedicated address at all? What an AI email agent needs from email starts a step earlier — the four requirements that hold whichever vendor you pick.
Feature by Feature
“DIY” means the capability can be assembled on the platform but is not enforced as a built-in service. “Not documented” means the public product documentation reviewed does not substantiate the capability; it does not mean the capability is impossible.
- Yes Built in
- DIY You assemble it
- Not documented No supporting public docs found
- No Not available
Swipe or scroll to compare →
| Capability | Postfleet | AgentMail |
|---|---|---|
| Comprehension & security | ||
| Prompt-injection screening with fail-closed handling | Yes | Not documented |
| Content sanitization with an audit report | Yes | Not documented |
| JSON Schema extraction with confidence scores | Yes | Not documented |
| Automatic message classification | Yes | DIY |
| Blocking wait for a matching email | Yes | Not documented |
| PDF text included in message processing | No | DIY |
| Inbound SPF / DKIM / DMARC verdicts surfaced | Yes | Not documented |
| Layered spam gate with quarantine and recovery | Yes | Yes |
| Virus gate with fail-closed delivery | Yes | Yes |
| Async attachment byte scanning before download | No | Not documented |
| Sending controls & delivery reliability | ||
| Server-enforced human approval before send | Yes | DIY |
| Automatic webhook retries | Yes | Yes |
| Dead-letter queue with self-serve redrive | Yes | Not documented |
| Inbox essentials | ||
| MCP server (hosted + local) | Yes | Yes |
| REST API | Yes | Yes |
| Webhooks | Yes | Yes |
| Send + receive | Yes | Yes |
| Custom domains (DKIM / SPF / DMARC) | Yes | Yes |
| Threading | Yes | Yes |
| Mailbox-scoped API keys with read / send flags | Yes | Yes |
| Send allowlists / blocklists | Yes | Yes |
| Idempotent message sends | Yes | Not documented |
| Where AgentMail is broader today | ||
| IMAP / SMTP access | No | Yes |
| WebSockets for realtime events | No | Yes |
| Python + TypeScript SDKs | No | Yes |
| Multi-tenant pods | No | Yes |
| SOC 2, SSO + dedicated IPs | No | Yes |
Sources & Methodology
Last verified July 15, 2026. We compared documented product behavior, not what could be built with additional infrastructure. AgentMail links point to its primary documentation; Postfleet links point to the product pages that describe the corresponding controls.