I installed Zimbra successfully and holds 4 domains so far. I having few problems.
1) Zimbra acts as an "open relay" to the world. I can connect to the server via SMTP port and send a mail to anywhere.
who can I prevent my Zimbra server from becoming a "spam" server?
220 zimbra.mydomain.com ESMTP Postfix
354 End data with <CR><LF>.<CR><LF>
250 Ok: queued as C6B2BB60C8
2) I like to use Zimbra as a "mail relay" to one more domain (internal mail server) and to be able to use it's antispam and antivirus capabilities. How do I do this?