http://mainsleaze.spambouncer.org/: " documents the experiences of several long-time anti-spam professionals and activists with bulk email sent by legitimate companies to us, to our spamtraps, or to email addresses on mail servers that we manage."
The site has links to additional spam fighting resources.
Spammers Don't Like Us Mailing List.
If people want to try something *different* to SpamAssassin, then someone suggested the following: Rspamd. From the mailing list:
It's written in C, uses events internally and you can write plugins and rules for it in Lua or you can use regexps for more basic stuff. It also supports Intel Hyperscan to compile all of the regexp rules, which is extremely fast and less IO intensive, it's Bayes implementation is considerably better than SpamAssassin's and it has a SpamAssassin compatibility plugin to allow you to load all of your SA rules into it if you want (I prefer to rewrite mine however).
I've found rspamd considerably more easier to do complex stuff that would require considerably more complicated Perl plugins to do in SA, but is simple to write using a bit of Lua code. It's not perfect, the docs could be better and there's currently no corpus testing or automatic score generation (this is coming from GSoC this year though hopefully).
Another tool: > A new project was released by the guys at SpamExperts - OrangeAssassin. "In essence this seems to be a Python rewrite of Spamassassin".
2021/09/20 - DMARC in rspamd - generating and sending DMARC aggregate reports