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From: Craig Sanders (castaz.net.au)
Date: Tue Sep 04 2001 - 17:38:04 CDT

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    On Tue, Sep 04, 2001 at 01:10:23PM +0200, Erwan David wrote:
    > Le Tue 4/09/2001, Ian Prideaux disait
    > > One thing that I'm seeing is a lot of spam whith a subject line like
    > > Subject: =?iso-8859-1?Q?Ecademy DailEnews=AE Tuesday 4th September?=
    > > Is this valid? If I block these, will I loose legitimate messages?
    >
    > Yes, it is the valid way to encode headers with non ASCII characters
    > in them.

    which means that it is useful to block messages with several
    non-printable characters in the headers.

    e.g. to reject messages with 5 or more consecutive non-printable
    characters in any header, add this to your header_checks file:

    /[[:^print:]]{5,}/ REJECT

    this blocks a lot of spam from china, korea, taiwan and other asian
    countries.

    craig 

    -- 
craig sanders <castaz.net.au>

    Fabricati Diem, PVNC.
 -- motto of the Ankh-Morpork City Watch
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