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ezmlm-reject(1) is by default configured to reject posts with empty subject (-s switch) or with a subject that consists of only an administrative command word (-c switch), such as ‘subscribe’. To remove these restrictions, use the ezmlm-reject(1) -S and -C switch, respectively. You can also into DIR/editor before the ezmlm-send(1) line add:
| grep -i 'subject:' | grep -if DIR/bad_words >/dev/null && \
{echo "bad words found"; exit 100; }
to reject messages that have a line matching ‘Subject:’ followed by any bad word listed in DIR/bad_words.