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A new kind of spam's been getting through my defenses lately with the following common characteristics:

  1. The message itself is of type multipart/mixed with two parts.
  2. The body of the spam is in the first part, of type text/plain.
  3. The second part is of type text/html and is empty:
----f3c31d93219a26172136ed0487d80041
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: base64

----f3c31d93219a26172136ed0487d80041--

How can I add a rule for recognizing such messages so SA can reject them?

Mikhail T.
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