Comparison — Postfleet vs SendGrid Inbound Parse
SendGrid Inbound Parse and Postfleet both turn inbound email into an HTTP payload, but they stop at different points. Inbound Parse posts parsed fields or raw MIME to your endpoint and leaves screening to you. Postfleet authenticates, sanitizes, screens for spam, malware, and injection, and delivers typed JSON an agent can read.
When the consumer of the email is an LLM agent rather than a parser you wrote. You get a stored, threaded mailbox the agent reads over MCP or REST, sender-auth verdicts, sanitization, spam and virus gates, a fail-closed injection scan, typed extraction, and a dead-letter queue for when your endpoint is down.
When you already send through SendGrid and need a plain MIME-to-webhook bridge into code you control, at volume, with your own parsing, storage, and spam handling. Raw MIME mode, 72 hours of retries, and signed payloads are all documented.
Pricing model. SendGrid has no separate charge for Inbound Parse; as of September 6, 2026 the pricing page’s plan table lists the Inbound Parse Webhook under Pro, from $89.95 a month, and Premier, and not under Essentials or the free trial. Postfleet is priced per comprehended message, at $0 for 100 a month, $20 for 1,500, and $200 for 25,000 or more, with unmetered sanitization on every plan.
“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.
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| Capability | Postfleet | Inbound Parse |
|---|---|---|
| Comprehension & security | ||
| Prompt-injection screening with fail-closed handling | Yes | No |
| Content sanitization with an audit report | Yes | No |
| JSON Schema extraction with confidence scores | Yes | No |
| Automatic message classification | Yes | No |
| Blocking wait for a matching email | Yes | No |
| PDF text included in message processing | No | Not documented |
| Inbound SPF / DKIM / DMARC verdicts surfaced | Yes | DIY |
| Layered spam gate with quarantine and recovery | Yes | DIY |
| Virus gate with fail-closed delivery | Yes | Not documented |
| Async attachment byte scanning before download | No | Not documented |
| Sending controls & delivery reliability | ||
| Server-enforced human approval before send | Yes | No |
| Automatic webhook retries | Yes | Yes |
| Dead-letter queue with self-serve redrive | Yes | No |
| Inbox essentials | ||
| MCP server (hosted + local) | Yes | No |
| REST API to read received messages | Yes | No |
| Webhooks | Yes | Yes |
| Send + receive | Yes | Yes |
| Custom domains (DKIM / SPF / DMARC) | Yes | Yes |
| Threading | Yes | Not documented |
| Mailbox-scoped API keys with read / send flags | Yes | No |
| Send allowlists / blocklists | Yes | DIY |
| Idempotent message sends | Yes | Not documented |
| Where SendGrid is broader today | ||
| Outbound sending at volume with deliverability analytics | No | Yes |
| Dedicated sending IPs | No | Yes |
| Official SDKs in Node, Python, Go, Ruby, PHP, Java, and C# | No | Yes |
| Sub-user management and SSO | No | Yes |
| Raw MIME delivery for your own parser | No | Yes |
Yes. The webhook payload carries an SPF field with the Sender Policy Framework result and a dkim field with signature verification results. No DMARC verdict field is documented, so a DMARC policy check is yours to compute. Postfleet surfaces SPF, DKIM, and DMARC verdicts on every inbound message.
Yes. Any response other than 2xx is retried at increasing intervals for 72 hours from the first failure. After that the message is dropped; SendGrid does not store received mail and shows no failure alert in the dashboard. Postfleet keeps the message in the mailbox and moves failed webhooks to a dead-letter queue you can redrive.
Partly. An opt-in setting adds a SpamAssassin spam_score and spam_report to the payload for messages up to 2.5 MB, but every message is still posted to your endpoint, and acting on the score is your job. Virus scanning of inbound attachments is not documented. Postfleet quarantines spam and fails closed on malware before the agent sees the message.
No. Inbound Parse is a one-way push: SendGrid posts the parsed fields or raw MIME once and keeps no retrievable copy, and the only inbound endpoints manage parse settings. If your agent needs to re-read a thread later, you store it. Postfleet stores messages in a threaded mailbox the agent reads over MCP or REST.
There is no per-message fee. As of September 2026 the SendGrid pricing page lists the Inbound Parse Webhook as a feature of the Pro and Premier plans, not the free trial or Essentials. Check the live page before you plan on it, since packaging shifts over time.
The same table and the same legend, against the other ways teams give an agent an inbox.
Last verified September 6, 2026. We compared documented product behavior, not what could be built with additional infrastructure. SendGrid Inbound Parse links point to its primary documentation; Postfleet links point to the product pages that describe the corresponding controls.