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Email blocked by Organization

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

n2fc

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

ASKER CERTIFIED SOLUTION

tsaico

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tsaico

In the link above, it is step 6 in the "To Create a New SMTP Virtual Server" section.

n2fc

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

Papertrip

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

NWCCSteve

ASKER

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.

NWCCSteve

ASKER

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

tsaico

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

NWCCSteve

ASKER

Thanks that fixed it