On 23/05/12 11:19, Branko Majic wrote: > As a curiosity, any ideas on what you would do to avoid use of this system > for spam purposes? (although encrypted spam won't be of much use :)
A simple challenge-response system should suffice, I'd say. When a new user mails to such an address, he receives a reply with a code that should again be mailed back to indicate the user is a human and can respond to the challenge. Bots could be adapted to defeat a lot of variations of this, but when it's a special-purpose design, I don't think it would be worth their time. Otherwise, use a captcha. I've never seen captcha's used in e-mail traffic, but it's easily done. Peter. -- I use the GNU Privacy Guard (GnuPG) in combination with Enigmail. You can send me encrypted mail if you want some privacy. My key is available at http://wwwhome.cs.utwente.nl/~lebbing/pubkey.txt _______________________________________________ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users