spam filtering errors

Jonas Maebe jonas.maebe at
Fri Jan 31 07:59:21 CST 2014


Since the latest update of the mailing list server, a lot of mails  
sent to this list are wrongly classified as spam by CodeWeavers' mail  
server. I've already sent a mail about this to postmaster at 
  several months ago, but got no reply and nothing appears to have  

It seems that the main culprit is the "SINGLE_HEADER_3K" spamassassin  
check, in combination with a very low spam score threshold (1.0).  
Below is an example from Stefan Dösinger's last mail (titled "dpnet  


X-Spam-Flag: YES
X-Spam-Report: Spam detection software, running on the system  
"", has
identified this incoming email as possible spam.  The original message
has been attached to this so you can view it (if it isn't spam) or label
similar future email.  If you have any questions, see
the administrator of that system for details.
Content preview:  Hi Alistair, A while ago I promised to have a closer  
   at your dpnet patches. ItXs a bit delayed, but here are some  
comments. How
    serious are you about dplay? Do you intend to do more work towards  
    it, or is that just wishful thinking on my part? [...]
Content analysis details:   (1.1 points, 1.0 required)
  pts rule name              description
---- ----------------------  
  3.0 SINGLE_HEADER_3K       A single header contains 3K-4K characters
  0.0 FREEMAIL_FROM          Sender email is commonly abused enduser  
mail provider
-1.9 BAYES_00               BODY: Bayes spam probability is 0 to 1%
                             [score: 0.0000]
  0.0 T_DKIM_INVALID         DKIM-Signature header exists but is not  

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