apnscp 3.0 released

apnscp v3.0, sponsored by project creep, has been released. This is the first public major release after 16 years of development. All major milestones have been implemented, including experimental preview of rspamd, a vastly superior spam filtering engine, that will power DKIM/ARC signing as well as rate-limiting outbound mail in future releases of apnscp.

This is a companion discussion topic for the original entry at https://hq.apnscp.com/apnscp-3-0-released/