Motivation

The private shopping website GILT, send periodical update emails from giltgroupe.bounce.ed10.net however all of the mails are signed with domain keys of giltgroupe.com.

mailed-by giltgroupe.bounce.ed10.net

signed-by giltgroupe.com

My Story

I couldn't manage to sign x.com with y.com 's domain key using dk-filter under Debian Lenny with postfix.

If I try to init dk-filter service with following arguments:

DAEMON_OPTS="$DAEMON_OPTS -d x.com,y.com -c nofws -k -i /var/dk-filter/internal_hosts -s /etc/dk-keys.conf"

dk-filter service signs with domain x.com (d=x.com)

If I change the daemon arg.s as following:

DAEMON_OPTS="$DAEMON_OPTS -d x.com -c nofws -k -i /var/dk-filter/internal_hosts -s /etc/dk-keys.conf"

then emails sent From y.com is not being signed.

the dk-keys.conf file is as follows:

*:/var/dk-filter/y.com/mail

I managed to do same thing with DKIM, works perfect. However DK doesn't seem to work. I don't have any problem signing y.com's emails with y.com's key and x.com's emails x.com's key, which indicates there is no configuration problem.

Do you have any experience/advice to make it possible to sign emails from multiple domains by a specific chosen domain?