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(Answer) (Category) SpamCop FAQ : (Category) Help for abuse-desks and administrators :
Formmail, one of the most-used perl scripts on the Web, is designed to send data entered into a Web form to an e-mail address. This script could be exploited by a malicious user who could use Formmail as a spam server. If you use this script, spammers may be able to use it to send spam freely using your server's resources.

A paper (long) explaining the FormMail vulnerability is available at

Secure fixes are available from:

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