I'm using a Zimbra Mail server installed on CentOS.
Which file should I configure for outgoing header to insert my company name and address so our sent emails will not be treated as a spam?
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You're missing a reverse DNS PTR record...
[root@xxx ~]# nslookup mail.aljeel.ly Server: 172.16.24.14 Address: 172.16.24.14#53 Non-authoritative answer: Name: mail.aljeel.ly Address: 22.214.171.124 [root@xxx ~]# nslookup 126.96.36.199 Server: 172.16.24.14 Address: 172.16.24.14#53 ** server can't find 188.8.131.52.in-addr.arpa.: NXDOMAIN
That's going to be the biggest factor in being able to send mail effectively.