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Spamfilter that combines C/R with DNS validation

Spamresponder is a very simple and radical spam filter that combines DNS validation with the challenge/response approach. It goes through the mail messages in /var/mail/$USER, looking for specific "trusted" strings in the header and body parts of the mail. It deletes and sends an automatic reply to messages which have no "trusted" strings inside them. Those replies will include one of the "trusted" strings, so the recipient just needs to reply to this confirmation message. The MailFrom-address of an email containing a trusted string becomes a trusted string itself



Verified by

Verified on


Verified by

Janet Casey

Verified on

27 April 2005

Leaders and contributors

Stephan Schmieder Maintainer

Resources and communication

AudienceResource typeURI
Bug TrackingVCS Repository Webview

Software prerequisites

Required to useNet_SMTP. FileHandle_Unget
Required to useWeakRef
Required to useMail_Mbox_MessageParser

This entry (in part or in whole) was last reviewed on 14 January 2017.


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