Re: nnml splitting on encoded headers

[Russ Allbery <rra@stanford.edu>]

Mark Thomas <swoon@bellatlantic.net> writes:

> Sometimes I get spam where the Content-Type is multipart/alternative
> and there is no charset listed in the headers.  For these, I use the
> following rule to catch un-encoded spam:
>     ("mail.spam.asian"     "^subject:.*[¡-ÿ]\\{4,\\}")
> I figure any mail with more than four high-bit characters in a row in
> the subject is probably not one I'm going to be able to read.

I've had extremely good luck with the following regex:

    .*[¹²³°¶÷¾].*

It still passes pretty much anything that's ISO 8859-1 or -15, and it
catches unencoded Korean and Cyrillic pretty reliably.  Adjust to taste if
you get unencoded subject headers in character sets other than ISO 8859-1,
of course.

-- 
Russ Allbery (rra@stanford.edu)             <http://www.eyrie.org/~eagle/>