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Postfix IPv4 Only

I have a postfix SMTP relay buried deep in a network behind proxy servers, all the infrastructure [sadly] is IPv4 only. This works, yet one ends up with many log messages like:

connect to[2603:1036:304:2857::2]:587: Network is unreachable

The server attempts if IPv6 result from the DNS lookup first. So let's make postfix use IPv4 only.

postconf -e inet_protocols=ipv4

That's it! No more "unreachable" log messages.

Multiple Interfaces On Windows

A great post over on Ivan Zlatev's BLOG on how to get a working configuration of multiple network interfaces on a Microsoft Windows workstation. There probably isn't anyone who has been forced to use that runt of an OS and not been frustrated by how it handles network connections.

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