Tags
security
postfix

/etc/postfix/header_cleanup_outgoing

/^\s*(Received: from)[^\n]*(.*)/ REPLACE $1 127.0.0.1 (localhost [127.0.0.1])$2
/^\s*User-Agent/ IGNORE
/^\s*X-Enigmail/ IGNORE
/^\s*X-Mailer/ IGNORE
/^\s*X-Originating-IP/ IGNORE
/^\s*Mime-Version/ IGNORE

/etc/postfix/main.cf

smtp_header_checks = pcre:/etc/postfix/header_cleanup_outgoing

  1. chmod 600 /etc/postfix/header_cleanup_outgoing