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The environment used for the most recent release builds has been Ubuntu 20.04. That is the setup
that is described on this page.

Whatever OS you use, do not a system that is already running SpamAssassin. If building and testing
a release package, there should be no system-wide SpamAssassin installed at all. Best practice is to
use a virtual machine that is dedicated for the purpose of building and testing SpamAssassin. Do not
use a public DNS resolver like Google's 8.8.8.8. They often have various blocks and filters that are
intended to protect users, but may cause spurious failures on tests like dnsbl.t. Use the DNS server
normally provided for your Internet connection.

CentOS 7 (deprecated for release building)

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