来自github:
https://github.com/wiggin77/mailrelay
mailrelay is a simple mail relay that can take unauthenticated SMTP emails (e.g. over port 25) and relay them to authenticated, TLS-enabled SMTP servers. Plus it's easy to configure.
Prebuilt binaries are available here for Linux, MacOS, Windows, OpenBSD.
mailrelay是一种简单的邮件中继,它可以接收未经验证的SMTP邮件(例如,通过端口25),并将它们中继到经过验证的、启用tls的SMTP服务器。另外,它很容易配置。
这里有针对Linux、MacOS、Windows和OpenBSD的预构建二进制文件。
采用go编写,github上有源代码和编译好的可执行文件。