Quote --

- The "rewrite_subject" configuration setting was deprecated and is now
  removed. Instead, use "rewrite_header Subject [your desired setting]".
  e.g.

    rewrite_subject ****SPAM(_SCORE_)****

  becomes

    rewrite_header Subject ****SPAM(_SCORE_)****

-- end quote

No released version of SA that I know of ever used the former syntax. 
Up to at least 2.60, it was:

  rewrite_subject { 0 | 1 }

That is, a boolean, not a score value.  I think the documentor has
conflated subject_tag with rewrite_subject, and I assume subject_tag
is also deprecated.

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