Spammers are figuring this type of system out. It's
seems that they are placing autoresponders at the
return address they send from or just find someone
who has an auto responder and send from that
address. You need to send back a random graphic of
a text message/word that the sender must read and
include in the reply. Machines would not be able
respond. Network Solutions already does this for
whois to keep bots from harvesting emails.
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