I am newbie in Zimbra. I just installed ZCS 8.0 on Ubuntu 12.04 and was trying to learn the configurations. I got stuck up while tried to setup System-wide Signatures. I found "zimbraDomainMandatoryMailSignatureEnabled (TRUE/FALSE)" and some other commands to enable this feature. But when I run this command on Ubuntu (switch user to zimbra) it is saying "command not found". Can someone help me with this. What am I doing wrong? Thanks.