OpenTrashmail

OpenTrashmail is an open source, standalone “trashmail” service that includes its own SMTP server for receiving email on your domains without pre-creating mailboxes. Messages can be viewed in a web interface or consumed programmatically via JSON, RSS, and webhooks.

Key Features

• Built-in SMTP server (Python-powered) that accepts mail for configured domains
• Web UI to browse messages, view HTML/text bodies, and manage inboxes
• JSON API for listing messages, retrieving full message details, and deleting mail/accounts
• Per-address RSS feeds for reading emails in RSS clients
• Webhooks (global and per-address) with customizable JSON payloads
• Attachment handling with download support and configurable size limits
• TLS support for SMTP via STARTTLS and TLS-on-connect
• File-based storage (no database required)
• Optional access controls: shared password, allowed IP ranges, and admin view

Use Cases

• Disposable inboxes for signups, testing, and avoiding spam on primary accounts
• Automation workflows that need to ingest emails (e.g., parsing verification or 2FA emails)
• Email honeypot/catch-all style collection for diagnostics and monitoring

Limitations and Considerations

• Not a full mail platform (no IMAP/POP3 mailboxes); focused on receiving and consuming messages via UI/API/RSS
• Running an SMTP listener typically requires careful network and DNS setup and may be impacted by ISP/cloud provider port restrictions

OpenTrashmail is well-suited for homelabs and development environments that need quick, disposable inboxes and machine-friendly access to received emails. Its file-based design and multiple consumption methods make it practical for both manual inspection and automated integrations.