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Tim
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Exchange Messages not being recevied by some clients

I have recently had issues with my Exchange 2003 server, OWA mis-configured and being placed on blacklists at the beginning of the week. I now have OWA working correctly and have been removed from all the blacklists however when I send an email to one of my customers they never get the email. the next day i get a delay report then the following day i get an NDR email. I have sent emails to that customer and have looked in the message tracking of Exchange and it says "Message Transferred to through SMTP"  which I assume means it was sent out however I don't see any of the receiving servers like I would if I sent to a Yahoo email. How can I find what is happening to these emails. I can send to the customer from my Yahoo account and they get it but not from our Exchange account.
ExchangeWindows Server 2003NetworkingWindows Networking

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masnrock

8/22/2022 - Mon
SOLUTION
alsh0083

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neilpage99

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Tim

ASKER
OK, that helped me but made issues more complicated. When I ran the ExTRA tool decribed in the forum it told me

The fully-qualified domain name of SMTP virtual server 'Default SMTP Virtual Server' on server <machinename> does not match the DNS resolved server name. This may cause mail routing problems. SMTP virtual server: mail.<subdomain>.com. DNS resolved server name: <machinename>.<domain>.com.

We had to create a sub-domain because our domain name had been taken on the net.

I tried changing the name in the SMTP virtual server but when I check the name it says invalid yet when I look on the DNS server it has that name created. It might have something to do with the subdomain but don't know how to resovle.
Tim

ASKER
OK, I thought I fixed it however it doesn't look like I did. I ran some tests using MXToolbox.com and my MX, PTR, A records all point to mail.subdomain.com but when I ran a test email from that site my spamserver answered the call as spamserver.subdomain.com. Would this cause the emails to be rejected by servers doing reverse dns? When I check reverse dns it shows mail.subdomain.com but this test makes me think different. Confused.
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