simplesmtp: Simple SMTP Server and Client Module

simplesmtp is a Node.js module designed for creating custom SMTP servers and clients, primarily targeting older Node.js environments (v0.6 to v0.8+). The package, currently at version 0.3.35, is explicitly deprecated and no longer maintained. It was developed without Node.js v0.10 streams, indicating significant compatibility challenges with Node.js v0.12 and newer versions. While it offers basic SMTP functionality suitable for integration testing, it lacks active development, security updates, and modern features. Users are strongly advised to migrate to modern alternatives like `smtp-server` for server implementations, `smtp-connection` for client-side operations, or `Haraka` for full-featured SMTP applications, which offer better performance, security, and compatibility with current Node.js releases. There is no ongoing release cadence.