[Mimedefang] Gibberish in the subject line
David F. Skoll
dfs at roaringpenguin.com
Tue Jul 16 10:52:01 EDT 2002
On Tue, 16 Jul 2002, Steve Ladendorf wrote:
> Has anyone written a rule to block email with gibberish in the Subject
> line like so..
> Subject: ¬[?] |h?Óºô¯¸ |hHWºô |h?Ó¶l¥óªººô¸ô¥D?÷ ¥i¥H10ÀÄÁº·d©w
> vFtBgl3ki3895s3BhB1LuV
You could match 8-bit characters. Something like:
sub filter_begin {
if ($Subject =~ /[\x80-\xFF]{7}/) {
return action_bounce("8-bit subject");
}
}
will drop subjects with 7 or more consecutive high-bit-set characters.
Another option is to check the character set; see
http://www.roaringpenguin.com/mimedefang/canit/recipes.php3 for an example
which drops Korean mail.
> I can't imagine that there is any reason to accept a message that contains
> characters like "Ó¶l¥óªººô" in the header.
Perhaps if you speak Korean, there is.
--
David.
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