This object is able to add or modify mail header attributes. As notice above, you can use xref:rule_system_macros[macros], making this a very powerful object. For example, the 'Modify Spam Level' actions adds detailed infomation about detected Spam characteristics to the ` X-SPAM-LEVEL` header.
-.Modify Spam Level Header Attribute
+.'Modify Spam Level' Header Attribute
----
Field: X-SPAM-LEVEL
Value: __SPAM_INFO__
Another prominent example is the 'Modify Spam Subject' action. This
simply adds the 'SPAM:' prefix to the original mail subject:
-.Modify Spam Subject Header Attribute
+.'Modify Spam Subject' Header Attribute
----
Field: subject
Value: SPAM: __SUBJECT__