Note: for Zimbra 8.6 and newer yum -y install epel-release yum -y install postgrey vim /etc/rc.d/init.d/postgrey find OPTIONS=”–unix=$SOCKET” replace with OPTIONS=”–inet=10023″ Centos 7 yum -y install epel-release yum -y install postgrey vim /etc/sysconfig/postgrey replace the line POSTGREY_OPTS=”–delay=60″ with POSTGREY_OPTS=”–delay=300 –inet=10023″ … Continue reading →