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There is a product out for Windoze (wish they'd do it for Linux if they
haven't already) that has a "white list" type approach. When a user sends
someone running the software a first email, the software replies back to the
sender requesting an authentication key (the same way that majordomo does for
the SLUG list). If a correct key is returned, the user is added to the
whitelist; if not, the user will continue to be rejected until the correct
authentication key is received.
SWB
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XO2fGkG8xYL2tl5dyuxIMQU=
=8OVn
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