Surely that's going to need to be:
/^Subject:(.*)\[MASSMAIL\](.*)/ REPLACE Subject: $1$2
Quoting Ralf Hildebrandt <r...@sys4.de>:
* Zalezny Niezalezny <zalezny.niezale...@gmail.com>:
As I see here header_checks can do it. There is only one problem. This rule
searching for a subject with string [MASSMAIL] and replacing complete
subject line with word "test".
/^Subject:.*[MASSMAIL].*/ REPLACE Subject: test
/^Subject:(.*)[MASSMAIL](.*)/ REPLACE Subject: $1$2
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