email-forwarding-checker 0.3.2

Checks if a configured email forwarding is working

Email Forwarding Checker

A small programm that periodically checks if a configured email forwarding for different addresses is working by sending test emails. Purpose is that you will get a notification via MQTT if forwarding stops working and it does not go unnoticed.

How it works

Configure a list of email addresses that should be checked. For those addresses there should be a forwarding configured. Then test emails will be sent periodically to those email adresses via a configurable SMTP server.

Lastly, it will be checked if the test emails arrived at the destination by looking into a configurable IMAP postbox. If the test emails do not arrive there within a specific amount of time, then the forwarding is considered to be not working.

Hot to use it

Install the Python package via pip, install it from source or use the docker image:

docker pull ghcr.io/verybadsoldier/email_forwarding_checker

Docker

Example docker-compose.yml:

version: '3'
services:
  email_forwarding_checker:
    image: ghcr.io/verybadsoldier/email_forwarding_checker:0.2.2
    container_name: email_forwarding_checker
    volumes:
      - ./config.yml:/config.yml
    restart: always
    environment:
      - TZ=Europe/Berlin

Configuration

Example config:

smtp:
  host: smtp.zoho.com
  username: myuser
  password: mypasswd
  sender: [e-mail]

imap:
  host: imap.zoho.com
  username: myimapuser
  password: myimappw

mqtt:
  host: 192.168.2.33
  topic_base: home/email_forwarding_checker

daemon:
  check_interval_hours: 1
  run_now: true  # run once instantly upon startup, then every check_interval_hours hours

email_timeout: 2400  # if the test email does not arrive with this time in seconds, then the forwarding is considered to have failed
repeat_interval: 5  # within email_timeout, check every n seconds for the test email
delete_emails: false  # delete the test emails from the IMAP postbox after arrival
emails:
        - [e-mail]
        - [e-mail]
        - [e-mail]