killfile

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kill·file

 (kĭl′fīl′)
n.
A file of character strings that are matched against incoming email or posts on electronic forums to eliminate items that one does not want to receive.
References in periodicals archive ?
You can, of course, download and install his kill file.
There's a school of thought on the Net--a libertarian place if there is one--that kill files constitute censorship.