Hi List,   
  
My e-mail server is running the latest spamassassin with all of the blacklist 
enabled and etc. 
but I still receive over 20 spam messages a day ("image" spam mostly). 
The situation with other users may be worse.  That's why I was thinking about 
some tool that 
1. store incoming email
2. send request to the sender of the message, requiring to go to some address 
and enter the numbers (letters) 
from image
3. if the puzzle is solved in time (week or so) deliver the message, otherwise 
delete it.

Is there such tool(s) ?

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