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As noted by Sven, email is not a 100% reliable system. That said, there are a couple of things you can do to make sure you're as close to 100% as possible. I would suggest that you put your Postfix config files into a configuration management app such as git, Mercurial, Subversion, etc. This will allow you to identify a known working config and can easily ...


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From your question it seems that you are connected, I guess over ethernet, to a /64 network from your VPS provider. In that case what you ask is not possible. Your upstream router would have to keep a Neighbor Discovery entry for each separate IPv6 address in memory, which will use much more memory than available (1). You can ask your provider to route a ...



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