I just installed Zimbra on FC4, no firewall. But I can't send any emails out from Zimbra server.
I can't telnet to any email server's port 25 from the Zimbra server, but can do it from other hosts in the same network.
It must be something in the Zimbra server simply block outbound port 25 traffic. Does anyone has similar experience?
Any help is highly appreciated!!
Here is the console output from Zimbra server:
[root@mail mail]# host -t MX gmail.com
gmail.com mail is handled by 10 alt1.gmail-smtp-in.l.google.com.
gmail.com mail is handled by 10 alt2.gmail-smtp-in.l.google.com.
gmail.com mail is handled by 50 gsmtp163.google.com.
gmail.com mail is handled by 50 gsmtp183.google.com.
gmail.com mail is handled by 5 gmail-smtp-in.l.google.com.
[root@mail mail]# telnet gmail-smtp-in.l.google.com 25
When try to run "telnet gmail-smtp-in.l.google.com 25" in another PC, I got the response right away.