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--- reference:spamrules_statement_addheader [2011/11/03 14:22] – Documented differences between insert/replace/remove simon
+++ reference:spamrules_statement_addheader [2018/11/14 10:45] (current) – external edit 127.0.0.1
@@ Line 13: / Line 13: @@
   * **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=====

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