23Feb/100
Removing Received field in mail header with Postfix
If you want to hide email source, you can easily remove Received field in mail header using header_checks.
Add to postfix configuration file main.cf line
header_checks = regexp:/etc/postfix/header_checks
File /etc/postfix/header_checks will contain
/^Received:/ IGNORE
More examples can be found at http://www.posluns.com/guides/hedrem.html