> is it possible to configure Postfix stmp daemon to add in its log the value > of a specific header?
If I understand the question correctly. To show headers for smtp "outgoing" emails in logs use smtp_header_checks, but for headers in smtpd "incoming" emails use header_checks. http://www.postfix.org/header_checks.5.html http://www.postfix.org/postconf.5.html#header_checks http://www.postfix.org/postconf.5.html#smtp_header_checks For example, to show the From and Subject headers on "incoming" emails do something like /etc/postfix/main.cf: header_checks = pcre:/etc/postfix/header_checks /etc/postfix/header_checks: /^From:/ INFO /^Subject:/ INFO
