SMTP to Teams Webhook Bridge

A simple service that accepts SMTP emails and forwards them to Microsoft Teams via webhooks.

Setup

1. Copy .env.example to .env:

   cp .env.example .env

2. Edit .env and add your Teams webhook URL:

   TEAMS_WEBHOOK_URL=https://outlook.office.com/webhook/your-webhook-url-here
   SMTP_PORT=25  # Change if needed
   

3. Start the service:

   docker-compose up -d

Usage

Configure your application to send SMTP emails to this service:

• SMTP Host: your-docker-host
• SMTP Port: 25 (or whatever you configured in .env)
• No authentication required

The service will:

1. Accept incoming emails
2. Convert them to Teams messages
3. Send them to your configured Teams webhook (webhook is now workflows)

Features

• Runs as a Docker service
• Automatic restart on failure
• Converts email subject and body to Teams adaptive cards
• Supports both plain text and HTML emails
• Logging for monitoring and debugging

Security Notes

• The service runs as a non-root user inside Docker
• No authentication is implemented - secure through network configuration
• Use in trusted networks only