Thanks, I am still a bit lost with pcre syntax, and
this complains something: postmap /etc/postfix/header_checks.pcrepostmap: warning: /etc/postfix/header_checks.pcre, line 20: expected format: key whitespace value
and this too: postmap: fatal: unsupported map type: pcre but, this works: postmap -fq "$subject" pcre:/etc/postfix/header_checks.pcre REPLACE Subject: testing 1 2 3 My postfix has pcre support, since postconf -m | grep pcre return pcre What I am doing wrong? thanks, -- Eero