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Webhook Payload

Webhooks are sent as POST requests with a JSON payload to the webhook_url you provided when creating or updating the inbox.

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Payload

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plain_text
string | null
The plain text content of the email. Can be null if the email is only available in html
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html
string | null
The html content of the email. Can be null if the email is only available in plain text
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alternative_content
boolean
If true, html and plain_text are alternative representations of the same content
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attachments
object[]
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to_addresses
object[]
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from_address
object
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cc_addresses
object[]
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bcc_addresses
object[]
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reply_to_addresses
object[]
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subject
string
The subject of the email
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date
string
The date of the email in ISO 8601 format
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in_reply_to_id
string | null
The id of the email that this email is a reply to, as passed in the In-Reply-To header. If null, this email is not a reply to another email
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references
string[] | null
A list of ids of emails that precede this email in a conversation thread, as passed in the References header. If null, this email is not part of a conversation thread
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message_id
string | null
The message id of the email, as passed in the Message-ID header. This is not the same as the BotMailRoom email id but rather is an id used by email clients and servers to identify emails
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id
string
The BotMailRoom ID of the email
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inbox_id
string
The ID of the inbox that received this email
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previous_emails
object[] | null
A list of emails that precede the root email in a conversation thread, as passed in the References header. If an email is not part of a conversation thread or is not the root email, this field will be null. Each object is the same structure as this object
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prompt
string
The email formatted as markdown that can be passed into an LLM prompt
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thread_prompt
string
The entire email thread formatted as markdown that can be passed into an LLM prompt. If the email is not part of a thread or is not the root email, this will be the same as the prompt property
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timestamp
string
The timestamp of the webhook in ISO 8601 format

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Configuring and Validating Webhooks

When creating or updating an inbox, you can specify a webhook_url.

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Signing Secret

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Getting the Signing Secret

You can create a signing secret by going to the webhook signing secrets page. When you create your first inbox, BotMailRoom will generate a signing secret for you if you don’t have one yet.
You will only receive a given signing secret once, so make sure to save it in a secure location.
If you need to regenerate the signing secret, you can do so by going to the secrets page, and clicking the regenerate button next to the signing secret.
When you create an inbox, you must select a signing secret to use from the dropdown if you have one.

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Using the Signing Secret

The webhook signing secret allows you to verify that an incoming request to your service is actually coming from BotMailRoom. You can use the python client or typescript client to verify the signature of the webhook: 
from botmailroom import verify_webhook_signature

verify_webhook_signature(signature_header, payload, webhook_secret)

import { verifyWebhookSignature } from "botmailroom";

verifyWebhookSignature(signatureHeader, payload, webhookSecret);
Alternatively, you can manually verify the signature, here’s how the process works:
  1. When BotMailRoom sends a webhook with the email payload, it creates a special signature by:
    • Taking the webhook payload (as raw bytes)
    • Using HMAC-SHA256 with your shared secret
    • Converting the result to a hexadecimal string
    • Including this signature in the X-Signature header
  2. When you receive the webhook, you need to:
    • Take the raw payload bytes
    • Generate the same signature using your signing secret
    • Compare signatures
    • To avoid replay attacks, you can also check the timestamp in the payload and ensure it’s within a reasonable time window
If the signatures match, you know:
  • The request definitely came from BotMailRoom
  • The data wasn’t modified in transit
Here’s an example of how to verify the signature in Python: 
import hashlib
import hmac
from datetime import datetime, timedelta

def verify_webhook_signature(
    signature_header: str, payload_bytes: bytes, webhook_secret: str
) -> bool:
    hash_object = hmac.new(
        webhook_secret.encode("utf-8"),
        msg=payload_bytes,
        digestmod=hashlib.sha256,
    )

    expected_signature = hash_object.hexdigest()
    signatures_match = hmac.compare_digest(expected_signature, signature_header)
    if not signatures_match:
        return False

    # Optional: check timestamp within some window
    payload = json.loads(payload_bytes)
    timestamp = datetime.fromisoformat(payload["timestamp"])
    age = datetime.now() - timestamp
    if age < timedelta(minutes=-1):
        # timestamp is in the future
        return False
    if age > timedelta(minutes=10):
        # timestamp is too old
        return False

    return True

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Testing Webhooks Locally

If you don’t have a public url to test with you can use smee or a similar service to create a temporary endpoint. Make sure to put that temporary endpoint in the webhook_url field when creating or updating your inbox. You can also do a one-time send to a specific url in the emails page by clicking on the resend icon in the Webhook Status column.
Resend Webhook

Resend Webhook

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Webhook Retry Strategy

If your webhook fails to be delivered (any status code outside of 2XX), BotMailRoom will retry an additional 6 times within a 12 hour period (initial interval of 30 seconds, backoff coefficient of 4). After that, you can still view the webhook log and resend it manually in the emails page.
Resend Webhook

Resend Webhook