Are you having trouble receiving mail? or sending mail?
Or do you just want to watch logs?
tail -f /var/log/zimbra.log
tail -f /opt/zimbra/log/mailbox.log
lookup the postqueue and postsuper commands - for instance:
-The admin console has a gui to this.
su - zimbra
Guessing maybe incoming trouble? (your 2nd post & that's the usual trouble people have after just setting up)
Incoming Mail Problems - Zimbra :: Wiki
Some key points:
You can also use Pingability.com
dig mx domain.com
dig any domain.com
(If you don't feel comfortable posting your domain name, you can PM any employees/mods who respond to this post if you would like us to check.)
Can you telnet to port 25 on that box? (from the outside - not any boxes on your lan)
If not: Firewall or even your ISP/hosting provider blocking port 25?
Do a tail -f /var/log/zimbra.log
-Do you see the connection attempts?
-Any errors there?
-Check the differed queue
If that appears ok, then tail -f /opt/zimbra/logs/mailbox.log do you see the mail showing up there?
-If not, the next question would be in regards to your dns setup...does this box have both a private & public ip?
If behind a NAT you may need:
host `hostname` <-- backticks not single quotes and use this command as is
Split DNS - ZimbraWiki