These days there tend to be a lot of repeats from the same popped hosts, so I’ve begun shitcanning whole domains (recent hits include ru.com, co.in, sa.com, gov.bd and com.ai). And here’s a fast way to do it from the shell:

/etc/postfix/sender_access: com.ai REJECT
/etc/postfix/main.cf: parent_domain_matches_subdomains += smtpd_access_maps

function bandomain() {
  sa=/etc/postfix/sender_access
  ( for d in $@; do
      printf "printf '%s\\\tREJECT Spammer\\\n' >> %s\n" $d $sa
    done
    echo postmap $sa ) |
    ssh mailhost sudo -S bash
}

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