[MIMEDefang] Postfix add headers to outgoing mails

Hi folks, 

sorry for my very basic questions about this milter and the necessary configuration to bind to the MTA. 
I'm very new in this field, but i searched the whole week for a solution and look at so much howtos, threads and other stuff. Please help me with this.

My situation at the moment:

My main goal is to add two headers on outbound mails which are send over postfix.
First i try this with the postfix feature header_checks and the PREPEND action to add the 2 headers which we need.
It seems that fir this only one rule with PREPEND is allowed in the header_check file, cause of the mechanism postfix go through them.

Now my new approach is using a milter on postfix, who i've read should such a tool should be able to add more then one header in a mail.
I decided for MIMEDefang. I read some HowTo's to bind this extra linux service on my postfix server, hopefully done this correct.
After that i rewrote the whole /etc/mail/mimedefang-filter, but the headers will never be added.
I dont find a log file from mimedefang for debugging purposes and also dont see anything in the maillog when i append "-vvv" in postfix master.cf after this line:
"smtp      inet  n       -       n       -       -       smtpd"

(System is CentOS7)

Configuration files:

########
#main.cf#
################################
smtpd_milters = inet:127.0.0.1:10025
################################


########################
#/etc/mail/mimedefang-filter#
########################################################################

sub filter_end {
        if ( $Sender =~ /^<[email protected]>?$/i ) {
                action_add_header("X-Auto-Response-Suppress", "DR,RN,NRN,OOF,AutoReply");
                action_add_header("Precedence", "list");
        }
}
1;
########################################################################


Kind regards,

Max Rößler

T-Systems Multimedia Solutions GmbH
Application Management & Cloud Services
Business Unit Application Management & Cloud Services
Max Rößler
System Engineer
Address: Riesaer Straße 7, 01129 Dresden, Germany
Postal address: Postfach 10 02 24, 01072 Dresden, Germany
+49 351 2820-7012 (Tel)
+49 160 7186124 (Mobil)
E-Mail:    [email protected]
Internet:  http://www.t-systems-mms.com

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