Auto-reply function for Email Inbox

Rossum's extension environment enables you to customize various day-to-day workflows. One of such workflows is to automatically reply to emails sent to Rossum's smart inbox. Automatic reply can be sent when receiving email with no attachments or to emails which contain specific content.

Setting up auto-reply function

Your auto-reply logic could look as:

  1. Filter list of received attachments in one email
  2. Use Rossum's emailing API to automatically reply if no suitable attachment is found

In order to achieve such behavior, create a custom function and assign the function to "email.received" event action. Afterwards, use the code below to reach the desired behavior.

from urllib import request, parse
from urllib.error import HTTPError
import json
import re

The rossum_hook_request_handler is an obligatory main function that accepts
input and produces output of the rossum custom function hook.
:param payload: see
:return: dict with files to be processed
def rossum_hook_request_handler(payload):
    if payload['event'] == 'email' and payload["action"] == "received":

            files = main(payload)

        except Exception as e:
            return payload["files"]
        return {"files": files}

Main function describes the auto-reply feature.
:param payload: dict representing the payload
:return: dict with the API response

def main(payload):
    incoming_files = payload["files"]
    auth_token = payload["rossum_authorization_token"]
    if len(incoming_files) == 0:
        if "headers" in payload:
            #subject = "Auto-reply for: {0}".format(payload["headers"]["subject"])
            subject = "Ignored email: {0}".format(payload["headers"]["subject"])
            from_text = payload["headers"]["from"]
            email = parse_email(from_text)
            #date = payload["headers"]["date"]
            #content = "Dear sender,\n\nwe have received an email with no attachments on {0}.\n\nBest regards".format(date)
            content = "Dear sender,\n\nwe have just received an email with no recognized attachments.\n\nOnly documents attached as PDF (or JPEG, PNG or TIFF) files are accepted.\n\n-- \n"
            response = send_email(subject, email, content, auth_token)
    return incoming_files
Use the Rossum email API to send email notifications.
:param subject: subject of the email
:param email: email of the recipient
:param message: message to be sent
:param auth_token: auth token for accessing the Rossum API
:return: None
def send_email(subject, email, message, auth_token):
    payload = {
        #"to": [{"email": email, "name": "Rossum Intelligent Inbox"}],
        "to": [{"email": email}],
            "subject": subject,
            "message": message
    data = json.dumps(payload)
    data = data.encode("utf-8")

    req = request.Request("", data=data)
    req.add_header('Authorization', "token {0}".format(auth_token))
    req.add_header('Content-Type', "application/json")

        r = request.urlopen(req)
        return r.getcode()

    except HTTPError as x:
        return {}
    return {}
Parse email from the "from" text
:param from_text: "from" representing the name and email of the sender
:return: string - parsed email
def parse_email(from_text):
    match ='[\w\.-][email protected][\w\.-]+', from_text)
    email =
    return email

When setting up the auto-reply custom function, you should:

  1. Make sure your organization is allowed to use custom functions that can access the internet. If you're not sure, please ask us at [email protected].
  2. Attribute token_owner of your hook should be setup so that you could authenticate to the Rossum's API with an authentication token. This can now be set in the Rossum's extension detail, as shown on the image below.
Enabling access to the Rossum API from extension.Enabling access to the Rossum API from extension.

Enabling access to the Rossum API from extension.