[Mimedefang] change_header doesn't add header

[David F. Skoll]

Marco,

I'm wondering if Sendmail treats the "Precedence:" header specially.
Could you try adding a different header?

      action_change_header('X-My-Custom-Header', 'For testing!');

If that works, then obviously Sendmail doesn't like milters to
change the Precedence: header for some reason.

Regards,

David.