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[程序员] 出于节约成本, 只用一个公网机器做 mail gateway,哪个方案更好点?

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帮朋友维护几台邮件服务器, 由于现在外贸业务惨淡,所以他要退掉尽可能多的服务器,只保留一台公网机器做 email gateway, 然后把邮件服务器部署在内网 VM 上(就是一个 PVE 跑十几台 VM )

目前公网机器和内网做了 headscale 组网没问题,我的问题是公网那台机器用什么最简洁的方法来做内网几台邮件服务器(不同部门无法合并为一台的情况)的 Gateway?

目前选项是公网那台机器跑 nginx 分流或者 proxmox mail gateway, 朋友意思是要尽可能压榨机器, 所以单纯的 proxmox mail gateway 独占还是尽量让位于可以跑 docker 的机器来实现(还可以跑其它服务比如 web)

我看 nginx 分流太复杂了,所以各位有什么更好的开源方案来实现?

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