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sa-filter-spam

-                      v3
+                      v4
 Some email programs also let you create a filter for "any header" and if yours does,  you can make a filter with the flag line
 X-Spam-Status: YES
+X-Spam-Flag: YES
 as the filter's trigger and have your program send the affected email to a special box (either trash or, if you want, a box you create -- you can call it "spam" for example). This method isn't recommended but it's possible so we include it.
+as the filter's trigger and have your program send the affected email to a special box (either trash or, if you want, a box you create -- you can call it "spam" for example). This method is the preferred method. It is better than the subject line method because someone might forward you a message with '*****SPAM****' in the subject line (maybe because they are pointing out that a message you sent them was tagged as spam). This message will get moved to your spam box even though it isn't spam. Using the X-Spam-Flag approach ensures that only messages that are tagged as spam will get filtered.
 The basic idea is that you are telling your email program to filter all messages that have the trigger line. In this way, you're using Spam Assassin as a kind of detective.