bun-smtpSMTP server for Bun

Drop-in replacement for smtp-server. Zero dependencies. Bun-native.

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Bun-native

Built on Bun.listen(), socket.upgradeTLS(), and Bun.CryptoHasher. No Node.js compat layer.

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Same constructor options, callbacks, and event names as the smtp-server npm package. Minimal migration effort.

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HELO, EHLO, MAIL FROM, RCPT TO, DATA, STARTTLS, LMTP, pipelining, DSN, and enhanced status codes.

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Fully typed API with strong types throughout. Callbacks, sessions, and envelopes are all strongly typed.