Perhaps utilizing Captcha.  Options including, whitelist as usual, or whitelist 
for X amount of time.  Require whitelist requester to specify recipient email 
address(which would be verified via validate recipient methods).  Option to 
send notification to recipient with any instructions, such as 
"sen...@notspammer.com has been whitelisted automatically and will remain 
whitelisted for N days.  If you wish them to be permanently whitelisted, please 
forward this notice to whitel...@...".  


Thoughts?




-Paul




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