I had installed Zimbra 7.1.4 in a CentOS6.2 OS.
All services are running fine.
However, when mail clients (Thunderbird, Outlook, Windows Live => SMTPS) and webmail clients (Firefox, Chrome, IE => HTTPS) try to connect in the server, they always show warning message, because they don't get to check that the server has a reliable certificate. Is there some way to solve this? The certificates were created in installing process, and after I tried to recreate them using the steps here ([SOLVED] SOLVED: Zimbra 6.0.1 stop working if SSL certificate is expired).