Pour prendre en charge DMARC sur un MTA Postfix, il convient d’installer OpenDMARC. Çà tombe bien c’est rapide.

Installation

root@mailsrv:~# cat /etc/apt/apt.conf
APT::Default-Release "stable";
root@mailsrv:~# nano /etc/apt/apt.conf
# stable
deb http://ftp.debian.org/debian wheezy main contrib non-free
deb http://security.debian.org wheezy/updates main contrib non-free

# testing
deb http://ftp.debian.org/debian testing main contrib non-free
deb http://security.debian.org testing/updates main contrib non-free
root@mailsrv:~# apt-get update
root@mailsrv:~# apt-get dist-upgrade
root@mailsrv:~# apt-get -t testing install opendmarc

Configuration de Postfix

root@mailsrv:~# nano /etc/postfix/main.conf
smtpd_milters = inet:127.0.0.1:8893
non_smtpd_milters = inet:127.0.0.1:8893