We are runnign Exchange SErver 2003, SP2 and F-Secure for Exchange Server with SPAM protection in use. Most things work OK, but I would like to know how to determine what causes a piece of email to be flagged as spam from the information in the message header. I don't know what all the codes mean. Some messages, that look harmless, end up in the SPAM mailbox, where i have to hunt for them and forward them manually. I could white list the sender, but why is it flagged in the first place? Maybe I could tweak f-secure or Exchange if i understood the codes.
Here is a sample:
X-OriginalArrivalTime: 07 Mar 2011 21:32:37.0779 (UTC) FILETIME=[2E186630:01CBDD0F]
X-Spam-Status: YES, hits=7 required=5, ct-refid=[str=0001.0A3D0202.4D754EF6.0077,ss=1,vtr=str,vl=0,fgs=0], tests=CTENGINE_UNKNOWN,DNS_AVAILABLE,FIRST_UNTRUSTED_MANY_NO_RDNS,FIRST_UNTRUSTED_NO_RDNS,FROM_LOCAL_NOVOWEL,FS_INVALID_HELO,FS_UNTRUSTED_5,HTML_MESSAGE,RDNS_NONE,FS_CLASS_SPAM_7