postfix header_checks using regexp proper setup

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http://serverfault.com – I just can't seem to figure out why header_checks are not being evaluated. I'm on Ubuntu 12.04, postfix 2.7, dovecote, spamassasin, clamav, amavis. I add following line to /etc/postfix/main.cf : header_checks = regexp:/etc/postfix/header_checks And here is header_checks : /From: .*/ REPLACE From: [email protected] To test out regexp : #postmap -q "From: <werwe>" regexp:/etc/postfix/header_checks which evaluates correctly and give me return output of : REPLACE From: [email protected] However, when I try to send email from commandline or from php webpage, pos (HowTos)