What is MailCue?
MailCue is an all-in-one email testing server packaged in a single Docker container. Unlike simple catch-all SMTPs, it provides a fully-featured mail stack with Postfix, Dovecot, SpamAssassin, DKIM/DMARC verification, and a modern React UI. Test your email workflows exactly as they behave in production with IMAP/POP3 access, API injection, real-time events, and GPG encryption. Perfect for local development, CI/CD pipelines, and ensuring your transactional emails actually deliver.
From the website
A fully-featured email testing server in a single Docker container. SMTP, IMAP, DKIM, DMARC, SpamAssassin, a REST API with Python & Node SDKs, an MCP server for AI agents, and a modern web UI. Run it for tests or as a real production mail server.
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