Without the ability to piggyback an advertisement on your email, there is little incentive to turn your script into a robot tool.
Right, which means the parameter that specifies which page is to be emailed can't specify an arbitrary URL that your script retrieves via HTTP.
1. "Enter the number you see in the image at right". It might be fun to try this with GD and/or ImageMagick. Fun. Hmmm....
There are at least a few existing modules on CPAN that implement captcha (http://en.wikipedia.org/wiki/Captcha) tests, including Authen::Captcha and GD::SecurityImage. I haven't tried either.
http://search.cpan.org/~unrtst/Authen-Captcha-1.023/ http://search.cpan.org/~burak/GD-SecurityImage-1.53/
Most spams appear to be plain text and rather short in length...
They may be short, but until recently the majority were not plain text. As far back as 1997 perhaps and as recently as a year ago you could catch 80% or more spam by simply filtering out HTML messages. Now the trend seems to be going back to plain text, with stats on one of my mailboxes showing plain text spam outnumbering HTML by 30% to 40%.
and perhaps this is an indication that spammers value efficiency...
Absolutely. Which is where tarpits come into play. (http://en.wikipedia.org/wiki/Tarpit_%28computing%29)
-Tom
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