go-smtp2telegram

Description

The go-smtp2telegram application is a tool that allows you to forward SMTP emails to Telegram. It provides a convenient way to receive email notifications directly on your Telegram account. It includes a webserver to be able to view html mails that is to complex for telegram and some basic spam protection

Stores html mail in ./mail/[chatId] folder, then sends a link to it to the user.

Quick hack to learn go, use with caution 😊

Installation / usage

Bare metal

To install and build the go-smtp2telegram application, follow these steps:

1. Clone the repository:

   git clone [email protected]:matst80/go-smtp2telegram.git

2. Change to the project directory:

   cd go-smtp2telegram
   go mod download

3. Build the application:

   go build

4. Create your configuration file config.json, copy example from config.example.json

5. Run the application:

   ./crapmail

Docker

Build the application or use matst80/go-mail2telegram

docker build -t mail2telegram .
docker run -v ./mail:/mail -v ./config.json:/config.json -p 25:25 -p 8080:8080 mail2telegram

Configuration

The config.json file is used to store configuration settings for your project. It typically contains various parameters that define the behavior and settings of your application. Let's take a look at some common parameters that you might find in a config.json file:

Remember to keep sensitive information, such as passwords or API keys, secure and avoid committing them to version control systems.

• listen address for smtp server default 0.0.0.0:25
• domain domain/hostname that the smtp server responds with
• token telegram bot token instructions
• hashSalt A string salt for basic user integrity (by no means safe) defaults to salty-change-me
• baseUrl webserver public address. f.ex. http://mail.domain.com
• users list of email and chatId objects, others will be discarded
• stopWords A list of blocking words that will be used for basic spam protection.
• warningWords A list of words that increases the spam ranking
• blockedIps A list of blocked ips
• warningWordsUrl Url to download spam wordlist separated by \n
• blockedIpUrl Url to fetch updated spam classed ip numbers separated by \n

Webserver that is used has basic hash so you can still share emails but at least have some security, strict content policy for everything except images and media

Telegram commands

/start

will log the chatId on the server

/add [email protected] [email protected]

Will add the the email addresses to the user that sends the message, sends the users list to be used to update the config.json file

/ips

Updates the blocked ips list if a blockedIpUrl is provided in the config

/words

Updates the warning word list if a blockedIpUrl is provided in the config

/config

Replies the current configuration json

/users

Replies the current users json