May be forged tag in the email header

I have an Exchange 2003 server behind a firewall. The untrust side of my firewall resolves to mail.mydomainname.com when a reverse DNS lookup is performed.  When Sending email and looking in to the headers, some receiving email servers place a (May be forged) note to the Received from line.

My server tags the outbound emails as myservername.mydomainname.com which is different from the resolution of the sending IP address mail.mydomainname.com
Received: from Myservername.mydomainname.COM (mail.mydomainname.com [xxx.xxx.xxx.65] (may be forged))

Questions:

What happens if I change the name of and Exchange 2003 server?  Will it keep working normally? or is ist a big risk to do that.  My rational behind that is that if I change the name to mail then the LAN and WAN tags in my outbound emails will match and hopefully resolve my "may be forged" problem)  some sites reject my emails and some let them through with the mentioned tag line

What can I do to resolve the issue with out changing the name of my server?


ThanX
stylmarkAsked:
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SembeeCommented:
You cannot change the name of a running Exchange server. You would have to migrate the data to a new machine, rebuild and then reinstall Exchange so that new databases are created.

It may just be an issue of what your Exchange server announces to the world - and that can be easily fixed:

1. ESM, Admin Groups, <your admin group>, Servers, <your server>, Protocols, SMTP.
2. Right click on the Default Virtual SMTP Server and choose Properties.
3. Click on the tab "Delivery" then "Advanced".
4. Where it has "Fully Qualified Domain Name" enter the name "mail.domain.com" (minus quotes, using your actual name).

Simon.
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stylmarkAuthor Commented:
Simon,

If I do what you suggest, what impact would that  have on email delivery with in my LAN.  Right now all my Outlook clients point to "myservername.mycompany.com" for their exchnage accounts.  If I change the name of my virtual SMTP server to mail.mycompanyname.com  woul I have to change the entry in my Outlook clients for their exchange account?

ThanX
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SembeeCommented:
It will have absolutely no impact on anything within your domain. Remember that the Outlook clients are using the AD to lookup the Exchange server - so this name has nothing to do with it.

Simon.
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OnsiteComputerMedicsCommented:
Just to be safe you could keep a CNAME record in DNS that will poing "myservername.mycompany.com" to "mail.mycompanyname.com"
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OnsiteComputerMedicsCommented:
Just to be safe you could add a CNAME record in DNS that will point "myservername.mycompany.com" to "mail.mycompanyname.com"

I should read what I write before I hit submit
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stylmarkAuthor Commented:
I answered my own question. It is OK to close this question
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VenabiliCommented:
Please post the solution. Otherwise I will have to recommend either award of points to someone or delete - NO refund

Venabili
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stylmarkAuthor Commented:
What I did to resolve the issue was to have my domain host  (We have a third party company hosting our domain) make an entry to resolve mail.mycompany.com to xxx.xxx.xxx.65  where  xxx.xxx.xxx.65 is the un trusted side of my firewall, then I just crated a policy to allowed traffic through my firewall to reach my exchange server.

The problem also was that my mx record and my mail.mycompany.com pointed to another company that sends/receives/scans/cleans my mail of viruses and spam, so when I was sending email the recipient server would see that it came from my server at that .65 address and it would compare to the reverse lookup and they were 2 different addresses so it thought it was forged.

Hope this helps someone.
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