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Email blocked by Organization

NWCCSteve
NWCCSteve asked
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I have a customer who has Exchange 2003 that has had problems sending email to a particular organization. When I followed up with this organization they said the following.

I have checked our mail relay logs and the problem is the FQDN your mail server is providing when connecting to our relay server.
Currently your server is configured to send servername.local which cannot be resolved outside of your local system. The correct response from your server would be mail.domainname.org.au as this address can be correctly resolved.
Please pass this advice to your IT team, as once this is corrected you should again be able to send to ahl.gov.au addresses.

Can someone explain what I need to do to resolve this matter, as we have been using this server for 4 years without a problem til now
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Commented:
The following guides have the info you seek:

Exchange Server Transport & routing guide
http://technet.microsoft.com/en-us/library/aa997477(EXCHG.65).aspx

How to help secure SMTP client message delivery in Exchange 2003
http://support.microsoft.com/kb/823019
Commented:
As I recall, this is on the SMTP virtual connector under the FQDN setting.  You want to set that as whatever your external ip resolves to (your external IP).  So for example,

Public IP=1.2.3.4
Resolves to=mail.here.com
you want to set your FQDN repsons to a Helo: mail.here.com.

So when your server is asked "who are you?" it will respond with your external IP, which the external email server can resolve on its own, and open will try in an attempt to cut down on spam.

Commented:
In the link above, it is step 6 in the "To Create a New SMTP Virtual Server" section.
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Commented:
This article also has additional about FQDN masquerading and "cookbook" tips for your issue:

http://exchangepedia.com/2007/12/masquerading-smtp-virtual-servers-changing-the-fqdn-and-masquerade-domain.html
Top Expert 2011

Commented:
Change the FQDN to match the FQDN of your sending server.  If possible, change the PTR to match, but it is not a requirement.

Author

Commented:
I think it is just the reply address I need to change that they get when you ehlo the server. Just trying to find it now but cant seem to see anything except in Default SMTP Properties /Delivery/Advanced/FQDN. Should I just change it there. Will that mess things up.

Author

Commented:
If I changed that FQDN  would it impact webmail or IPhones from working

Commented:
It shouldn't.  Your external address is still the same, which is what the iPhones and webmail will look to when initiating a request.

Author

Commented:
Thanks that fixed it

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