spamassasin unable to read Japanese when it is html encoded

lepe

3/18/23, 2:21 AM

I would like to block some emails which contains certain Japanese words, but spamassassin fails to detect such words when the email is HTML encoded, for example:

This is a multi-part message in MIME format.
--------------050206070005060005050706
Content-Type: text/plain; charset=ISO-2022-JP; format=flowed
Content-Transfer-Encoding: quoted-printable

&#12371;&#12435;&#12395;&#12385;&#12399;&#65281;&#27531;&#24565;&#12394;&=
#12364;&#12425;&#20982;&#22577;&#12364;&#12372;&#12374;&#12356;&#12414;&#=
12377;&#12290;&#25968;&#12534;&#26376;&#21069;&#12289;&#12354;&#12394;...

--------------050206070005060005050706
Content-Type: text/html; charset="ISO-2022-JP"
Content-Transfer-Encoding: quoted-printable

<html>
  <head>

    <meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3DISO-2022-JP">
  </head>
  <body bgcolor=3D"#FFFFFF" text=3D"#000000">
    &#12371;&#12435;&#12395;&#12385;&#12399;&#65281;</br>
</br>
&#27531;&#24565;&#12394;&#12364;&#12425;&#20982;&#22577;&#12364;&#12372;&=
#12374;&#12356;&#12414;&#12377;&#12290;</br>
...
  </body>
</html>
--------------050206070005060005050706--

Example rule in spamassassin:

body     JAP_BAD_1  /残念ながら凶報がございます/
score    JAP_BAD_1  5.0

However, when I run the test:

spamassassin -D textcat -t spam.test

It doesn't show up the match. What do I have to do?

0 + 0

spam

spam-filter

spamassassin

anx

3/28/23, 10:09 AM

Any reason to not simply reject *all* mail with numeric html entities in supposedly `text/plain` type parts?

lepe

3/29/23, 1:46 AM

@anx I'm not sure if doing that may reject authentic messages.

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