Jason White <jason@jasonjgw.net> writes:
What would others recommend these days as an anti-spam tool, suitable for integrating into a Postfix/Dovecot configuration?
My experience: Spamassassin Dspam CRM114
These are all post-DATA. You should be rejecting as much as possible BEFORE then, using postscreen, a null MX, a tarpit MX, and so on. Here post-DATA filtering is opt-in, because only managers need it. They get crm114 which is pretty ordinary because our dovecot1 and their mutt MUA don't support the hooks to recognize "I'm moving the mail into Spam folder", so instead there's a nightly cron job that looks for mail with an mtime of "a couple of days ago" and processes that. It's pretty ugly, but they seem to be very happy with the results.