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, including IMAP / SMTP, WebSockets, official SDKs, or multi-tenant pods, and your team will build its own message-processing layer.
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 | Yes | 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 | Yes | 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.