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--- reference:spamrules_statement_addheader [2011/08/23 14:47] – created simon
+++ reference:spamrules_statement_addheader [2018/11/14 10:45] (current) – external edit 127.0.0.1
@@ Line 2: / Line 2: @@
 ^Statement  |AddHeader |
 ^Version  |2.1.7+ |
-^Purpose  |Allows you to add or replace the specified header line to the message headers |
+^Purpose  |Allows you to add, replace or remove the specified header line in the message headers |
-The **AddHeader** statement requires the full text of the header in one continuous string, in the format
+The **AddHeader** statement requires the full header line in one continuous string, in the format
-  AddHeader "<header to add>"
+  AddHeader "<full header line>"
-=====Example=====
+  * If the header line is present:
-Changing the subject
+    * It will be replaced if an alternative value is specified.
+    * It will be removed if no value is specified.
+  * If the specified header is not already present, it will be inserted at the end of the headers.
+  * **AddHeader** should not be used where the header name may appear more than once (e.g. "Received: ...").
+From VPOP3 v6.20 onwards, the header modifier format has been extended:
+  * If you prefix it with -, it will be added at the the start of the final headers
+  * If you prefix it with +, it will be added at the end of the final headers
+  * If you prefix it (after the -/+ above) with "{"<username>"}" (eg ''{bob}Subject: Bob's new subject'' ) it will only be added to the headers when placed into that user's mailbox
+  * If you prefix it with #, it will remove the header if the data matches the regular expression specified in the modifier's data - eg ''#Bibble: ^[a-z]{5}$'' - otherwise the original header will be left in place
+  *
+=====Examples=====
+Changing the subject header
 <code>
 AddHeader "subject: VPOP3SPAM ${Subject}"
+</code>
+Removing a header line, by not setting a value
+<code>
+AddHeader "X-MyHeader:"
+</code>
+Changing the value of a header, or inserting it if it does not already exist
+<code>
+AddHeader "X-MyHeader: The new value of the header named X-MyHeader"
 </code>

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