On Wed, 10 Jun 2009, Ralf Hildebrandt wrote: > * Gábor Lénárt <[email protected]>: > > > > This is a backscatter source and will get you blacklisted in no time. > > > > Hmm, what would be if someone use a policy server, rejecting the mail with > > the link for the captcha URL in it. > > That sound interesting. It could work! It definitely solves the > backscatter issue.
postfilter (http://www.kfki.hu/cnc/projekt/postfilter/) supports captcha protection and it does exactly that way: the URL is sent in the error text part of the rejection. Best regards, Jozsef - E-mail : [email protected], [email protected] PGP key : http://www.kfki.hu/~kadlec/pgp_public_key.txt Address : KFKI Research Institute for Particle and Nuclear Physics H-1525 Budapest 114, POB. 49, Hungary
