Hi all, I'm trying to modify all the outgoing email. So I've manage to do something but it's not the right way (DKIM fail) In my master.cf : Code: 127.0.0.1:10027 inet n - n - - smtpd -o content_filter=dfilt: dfilt unix - n n - - pipe flags=Rq user=filter argv=/etc/postfix/disclaimer -f ${sender} -- ${recipient} and my disclaimer : Code: #!/bin/sh # Localize these. INSPECT_DIR=/var/spool/filter SENDMAIL=/usr/sbin/sendmail # Exit codes from <sysexits.h> EX_TEMPFAIL=75 EX_UNAVAILABLE=69 php -f /var/www/test-infos/ok.php in.$$ [email protected] # Clean up when done or when aborting. trap "rm -f in.$$" 0 1 2 3 15 # Start processing. cd $INSPECT_DIR || { echo $INSPECT_DIR does not exist; exit $EX_TEMPFAIL; } #cat > in.$$ || { echo Cannot save mail to file; exit $EX_TEMPFAIL; } #/usr/bin/altermime --input=in.12 \ # --disclaimer=/etc/postfix/disclaimer.txt \ # --disclaimer-html=/etc/postfix/disclaimer.txt \ # --xheader="X-Copyrighted-Material: Please visit http://www.company.com/privacy.htm" || \ # { echo Message content rejected; exit $EX_UNAVAILABLE; } $SENDMAIL -oi "[email protected]" <in.$$ exit $? After that I'm using PHP to modify mail email content like this : Tho goal of this is to track all outgoing email and to get some stats on the opening rate. Thanks for your help ! PHP: try { $db = new PDO($dsn, $user, $password, array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8', PDO::ATTR_ERRMODE => PDO::ERRMODE_WARNING)); } catch (PDOException $e) { echo 'Connexion échouée : ' . $e->getMessage(); } $file = fopen("/var/spool/filter/".$argv[1], "a"); $from = $argv[3]; $to = $argv[5]; $insert = $db->prepare('insert into emails (emailfrom, emailto) values (:emailfrom, :emailto)'); $insert->bindParam(':emailfrom', $from, PDO::PARAM_STR); $insert->bindParam(':emailto', $to, PDO::PARAM_STR); $insert->execute(); $id = $db->lastInsertId(); $input = file_get_contents("php://stdin"); $input = str_replace( '</body>', '<img src="http://myURL.com/ok/open.php?id='.$id.'" height="1" width="1"/></body>', $input ); fwrite($file, $input); fclose($file);