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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?

Thanks.

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Is it your headers that are causing rejections or lack of SPF records? What is the error or spam message you are getting? – Tim Feb 2 at 14:26
It's a lack of both headers and SPF but let me do the headers first and here is the orginal message I'm getting from gmail: – Alaa Tulti Feb 2 at 15:10
It's a lack of both headers and SPF but let me do the headers first and here is the orginal message I'm getting from gmail: from mail.aljeel.ly ([41.78.60.35]) by mx.google.com with ESMTP id p56si1021107eeh.133.2012.02.02.02.23.36; Thu, 02 Feb 2012 02:23:37 -0800 (PST) Received-SPF: neutral (google.com: 41.78.60.35 is neither permitted nor denied by best guess record for domain of a.tulti@aljeel.ly) client-ip=41.78.60.35; Authentication-Results: mx.google.com; spf=neutral (google.com: 41.78.60.35 is neither permitted nor denied by best guess record for domain of a.tulti@ – Alaa Tulti Feb 2 at 15:18
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1 Answer

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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: 41.78.60.35

[root@xxx ~]# nslookup 41.78.60.35
Server:         172.16.24.14
Address:        172.16.24.14#53

** server can't find 35.60.78.41.in-addr.arpa.: NXDOMAIN

That's going to be the biggest factor in being able to send mail effectively.

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