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npm / smtp-server

smtp-server

What changed in smtp-server 3, from its official release notes, upgrade guides and advisories. Also covers @types/smtp-server. Sources checked 2026-10-21.

1 security1 tooling1 fixes and other

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smtp-server 33 changes

Security 1

  • Hardens connection lifecycle handling, TLS timeouts and the DATA stream.

    3.20.0release notes

Tooling 1

  • The project migrated to TypeScript and now provides ES module and CommonJS builds.

    3.20.0release notes

Fixes and other changes 1

  • The server side of a connection closes as soon as the client leaves after QUIT.

    3.20.0release notes