I've recently turned to rspamd 1.7.1 as my antispam solution.
So far, it seems to be effective, but I've only been using it for a day or so.
Interestingly, the latest version offers neural network-based analysis, which
is probably the right direction for development to be taking (as one factor in
making the classification decision).
I also found that I could eliminate a lot of undesirable SMTP connections by
setting reject_unknown_client_hostname in the Postfix configuration. My host
is well connected with good DNS resolution, so I assume that any errors in
this regard are probably due to the client host's not being a legitimate mail
Comments and suggestions for further improvement are welcome.
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