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Policy Patrol Spam Filter for Exchange
Server and Lotus Domino includes a gray listing
system that initially rejects emails from new senders
for 2-3 minutes. Since regular mail servers will
try to resend the message, their messages will still
be delivered. However since spam engines are not
proper mail servers and designed only to send out
as much mail as possible, they will not try to resend
the mail and therefore never get through. Gray listing
can also stop virus outbreaks that are being spread
from zombie machines since these use primitive mail
sending systems that fail to resend the message
upon initial rejection.
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| Policy Patrol
Spam Filter |
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