title: "Inbound" description: "Store a raw RFC 5322 message in your inboxes as if it had been received. Requires the inbound_raw permission; authentication results in the message are ignored." canonical: "https://machinemail.dev/docs/reference/api/inbound"

Inbound

Store a raw RFC 5322 message in your inboxes as if it had been received. Requires the inbound_raw permission; authentication results in the message are ignored.

Source: https://machinemail.dev/docs/reference/api/inbound

Inject Raw Message

POST /inbound/raw

Stores a raw RFC 5322 message (the request body, any Content-Type, at most 40 MB) as if it had been received, once per recipient inbox in the credential’s scope. The recipient is X-Recipient, otherwise every To and Cc address.

Injected messages are marked received_via: "raw". Their trust report never believes the authentication results they carry (headers and provider verdicts are ignored): authentication is none, so the trust level is at most unknown.

An unrestricted key (*) does not imply inbound_raw; it must be granted by name.

Injected mail counts toward plan limits like any other inbound mail, even when the trust layer marks it spam or quarantined (its content is yours). On the Free plan, a copy past the monthly or daily allowance (or past storage) is held: it is listed in held, not in messages, and delivered when the allowance resets or after an upgrade.

Authentication: Authorization: Bearer <api key> or the dashboard mm_session cookie.

Headers

Request body

Content type: message/rfc822. Required.

Type: string (binary)

Response

201 Stored (or held) (application/json)

Each item of messages is a Message:

Errors

Error bodies use the error envelope.

Example

curl -X POST "https://api.machinemail.dev/inbound/raw" \
  -H "Authorization: Bearer $MACHINEMAIL_API_KEY" \
  -H "Content-Type: message/rfc822" \
  --data-binary @body

{
  "count": 1,
  "messages": [
    {
      "inbox_id": "agent@machinemail.dev",
      "thread_id": "thd_01k6x3a1fz0000c9k5ns1x4e6g",
      "message_id": "msg_01k6x3a1g00000d0m6pt2y5f7h",
      "labels": ["UNREAD"],
      "timestamp": "2026-10-01T12:00:00.000Z",
      "from": "Support Agent <agent@machinemail.dev>",
      "to": ["customer@example.com"],
      "cc": ["team@example.com"],
      "bcc": ["audit@example.com"],
      "subject": "Order #1042",
      "preview": "Thanks for the quick reply.",
      "attachments": [
        {
          "attachment_id": "att_01k6x3h7qv0000m7v3xb9f2p4r",
          "filename": "invoice.pdf",
          "size": 2048,
          "content_type": "application/pdf",
          "content_disposition": "string",
          "content_id": "string"
        }
      ],
      "in_reply_to": "msg_01k6x3a1g00000d0m6pt2y5f7h",
      "references": ["string"],
      "headers": {
        "key": "value"
      },
      "authentication_results": {
        "spf": "pass",
        "dkim": "pass",
        "dmarc": "pass",
        "spf_domain": "string",
        "dkim_domain": "string",
        "dmarc_domain": "string",
        "arc_sealer": "string"
      },
      "size": 2048,
      "updated_at": "2026-10-01T12:00:00.000Z",
      "created_at": "2026-10-01T12:00:00.000Z",
      "pod_id": "pod_01k6x2m9qd0001b8j4mr0w3d5f",
      "direction": "inbound",
      "delivery_status": "sent",
      "trust_level": "verified",
      "reply_to": ["agent@machinemail.dev"],
      "text": "Thanks for the quick reply.",
      "html": "<p>Thanks for the quick reply.</p>",
      "extracted_text": "Thanks for the quick reply.",
      "extracted_html": "<p>Thanks for the quick reply.</p>",
      "received_via": "raw",
      "held_at": "2026-10-01T12:00:00.000Z",
      "trust": {
        "level": "verified",
        "score": 0.8,
        "basis": "trusted_domain",
        "authentication": {
          "spf": "pass",
          "dkim": "pass",
          "dmarc": "pass",
          "aligned": false
        },
        "sender": {
          "address": "agent@machinemail.dev",
          "domain": "example.com",
          "prior_correspondence": false,
          "on_allow_list": false,
          "on_block_list": false,
          "free_mail_provider": false,
          "trusted_domain": {
            "id": "string",
            "domain": "example.com",
            "scope": "org"
          },
          "trusted_domain_shadowed_by": "block"
        },
        "content": {
          "text": "Thanks for the quick reply.",
          "html": "<p>Thanks for the quick reply.</p>",
          "segments": [{}],
          "hidden_text_found": false,
          "zero_width_found": false,
          "tracking_pixels": 1,
          "agent_instructions_detected": false,
          "warnings": ["string"]
        },
        "links": [
          {
            "href": "string",
            "text": "Thanks for the quick reply.",
            "final_url": "https://example.com",
            "domain": "example.com",
            "display_mismatch": false,
            "shortener": false,
            "suspicious": false,
            "reasons": []
          }
        ],
        "attachments": [
          {
            "attachment_id": "att_01k6x3h7qv0000m7v3xb9f2p4r",
            "filename": "invoice.pdf",
            "content_type": "application/pdf",
            "risk": "low",
            "reasons": [],
            "extracted_text": "Thanks for the quick reply."
          }
        ],
        "classification": {
          "is_spam": 0.8,
          "is_phishing": 0.8,
          "contains_instructions_to_agent": 0.8,
          "requests_credentials_or_payment": 0.8,
          "urgency": 0.8,
          "category": "transactional",
          "language": "string",
          "backend": "string",
          "input_hash": "string",
          "cached": false
        },
        "provider_verdicts": {
          "spam": "pass",
          "virus": "pass",
          "source": "string"
        },
        "reasons": ["string"],
        "computed_at": "2026-10-01T12:00:00.000Z"
      }
    }
  ],
  "errors": [
    {
      "recipient": "string",
      "message": "string"
    }
  ],
  "held": [
    {
      "recipient": "string",
      "reason": "monthly"
    }
  ]
}