N E T V I R T E X P E R T

    Useful cmd for quick checking compromised account in case of internal spam: cat /var/log/zimbra.log | sed -n 's/.*sasl_username=//p' | sort | uniq -c | sort -n Accont with much difference in sent mails is the one to inspect...

    These are install requirements that I personally use when I'm playing with lab/production Zimbra open source mail servers: - CentOS OS (minimal ISO) - base OS for Zimbra installation from  https://www.centos.org/download/ - 8GB+ RAM, 10GB+ HDD, 2+ vCPU Zimbra installation: DISABLE POSTFIX FROM BASE CENTOS INSTALL WHICH COMES BY DEFAULT -  systemctl stop postfix / systemctl remove postfix disable iptables firewall - assumes you have some other firewall at public side for your mail server set  selinux  adequately at  /etc/sysconfig/selinux setup local DNS adequately at  /etc/hosts -  you must resolve domain names which you are going to use in mail server so that system successfully works - even installer checks for resolvable hostname via DNS tar xzvf [zcsfilename.tgz] -  unpack previosly downloaded file from  https://www.zimbra.com/try/zimbra-collaboration-open-source/ cd [zcsfilename] ./install.sh -  begin installation...