I have been testing smtp_header_checks, without much success.
Setup #1
In /etc/postfix/checks_smtp_headers
/^Message-id:/i IGNORE
# postmap /etc/postfix/checks_smtp_headers
In /etc/postfix/main.cf
smtp_header_checks=pcre:/etc/postfix/checks_smtp_headers
# service postfix restart
When I send...
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