Activate dag repository
[dag]
name=Dag RPM Repository for Red Hat Enterprise Linux
baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag
gpgcheck=1
install package
root@ns99 ~ # yum install postgrey
edit startup script /etc/init.d/postgrey
#OPTIONS=”–unix=$SOCKET”
OPTIONS=”–whitelist-clients=/etc/postfix/postgrey_whitelist_clients –whitelist
recipients=/etc/postfix/postgrey_whitelist_recipients –inet=10023 -d –unix=$SOCKET”
startup postgrey when system is bootup
root@ns99 ~ # chkconfig postgrey on
install filter to postfix /etc/postfix/main.cf
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, check_policy_service inet:127.0.0.1:10023
edit white-list as you need /etc/postfix/postgrey_whitelist_clients
Check delay from maillog
cat /var/log/maillog | postgreyreport