For my monthly typing-injury FAQ, which is sent to three LISTSERV's, my posting
script appends the current date to the end of the FAQ, e.g.:
 
    echo "To: [log in to unmask]" > $tmpfile
    cat $faq >> $tmpfile
    echo -n "Mailing date: " >> $tmpfile
    date >> $tmpfile
    /usr/lib/sendmail -t < $tmpfile
 
This handily defeats the checksum mechanism.
 
Dan
--
Dan Wallach               "One of the most attractive features of a Connection
[log in to unmask]  Machine is the array of blinking lights on the faces
Office#: 510-540-5535     of its cabinet." -- CM Paris Ref. Manual, v6.0, p48.