What does the complete file /etc/postfix/headerstring look like?
Does another line match a filter action and override the desired result?
Have you defined any other header_checks (body for example)?
That should be enough, too:
/^Subject: .*\[cleartext\]/ FILTER cleartext:
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Hello
If I have configured a maximum queue lifetime of 2 days and during a major
outage 2000 mails accumulate in the deferred queue, what happens to these
2000 mails if I increase the queue lifetime to 5 days and reload Postfix?
Does the new lifetime only apply to new mails or also to existing
