chasquid

chasquid is an SMTP (email) server designed to send and receive mail like a traditional MTA, with an emphasis on simplicity, secure defaults, and ease of operation. It is aimed primarily at individuals and small groups who want a manageable mail server without excessive complexity.

Key Features

• SMTP server for sending and receiving email (MTA functionality)
• Secure-by-default behavior to avoid harmful misconfiguration (for example, preventing open relays and clear-text authentication)
• Multiple and virtual domains with per-domain users and aliases
• Support for address suffix dropping (user+tag@domain to user@domain)
• Dovecot integration for authentication
• Hooks for integrating greylisting, anti-virus, anti-spam, and DKIM/DMARC tooling
• SPF and MTA-STS checking
• Per-domain tracking of TLS support to prevent downgrade attacks
• Multiple TLS certificates and easy integration with Let's Encrypt
• Monitoring HTTP server with exported variables and tracing for debugging

Use Cases

• Running a small personal or family email server with safer defaults
• Hosting mail for a small organization with multiple domains and aliases
• Replacing heavier MTAs (such as Postfix or Exim) where simpler operation is preferred

Limitations and Considerations

• Not intended to replicate the full breadth of features and ecosystem integrations typical of very large-scale MTAs

chasquid provides a pragmatic SMTP server focused on operational simplicity while maintaining strong security practices. It is a solid fit when you need a traditional MTA with modern security checks and minimal administrative overhead.