I'm a rookie when it comes to Zimbra so please, bear with me.
I installed Zimbra 7.13 on my Ubuntu 10.04 LTS Server. It installed smoothly and was able to make Zimbra up and running. I also used split DNS (bind9) since my Zimbra server is behind a firewall (pFsense). I also added the needed port rules on pfsense in order to make the Zimbra server work. By the way, I'm using pFsense 2.0.
Here's the issue. I can send and receive emails internally. But when I try to send an email to Gmail or Yahoo, the mail stays on "Deferred" under Mail queues on the Zimbra admin page. Here is the error details:
From host: localhost.localdomain
From IP: 127.0.0.1
To domain: gmail.com
Reason: connect to alt4.gmail-smtp-in.l.google.com[18.104.22.168]:25: connection timed out.
Please take note that I edited the email addresses and domain in the error message for security purposes.
I hope someone can help me with this issue.
Thank you in advance!