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Exchange 2000 DNS / SMTP Issue

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Exchange 2000 DNS / SMTP Issue - 28.Jan.2008 11:23:59 AM

manny61

Posts: 9
Joined: 22.Aug.2007
Status: offline

Hello All,
I have an Exchange 2000 (SP4)SBS server: lately we've experienced a lot of problems sending email out using SMTP. eMails are either delayed, undeliverable or take around 1 hour to reach destination. The SMTP hosts are telling me there is an internal issue, so I start looking at DNS. (Web browsing seems unaffected).
The DNS Event viewer is giving me event id 5501:"The DNS server encountered a bad packet from 217.79.96.70....etc", in the App Log I get: event id 984 nd id 4003 "the domain etc.com is unreachable" for several domain names.
All the info I found refers to the use of NSLOOKUP as a troubleshooting tool. I tried this and when I run:
set q=mx
msn.com
server: servername
address: 217.79.96.70
DNS request timed out

So clearly there is something wrong, however I do not know where to take this!
I have double checked all instances of DNS server settings in the server (Internet connector Wizard) and in the SMTP connector on Exchange...

Another weird thing to note: when using IPCONFIG /ALL, the DNS servers were wrong (they were set to our old provider), using the Internet Config Wizard to change these had no effect (used /FlushDNS and /RegisterDNS afterwards), I ended up changing these manually in the Network Connections, TCP-IP Properties for the interface card.

To add to the above:
I have now run the "Exchange Troubleshooting Assistant" on exchange, because the" Unreachable Destination" queue is stacking up:
This is what the Assistant found:
Remote delivery queue SMTP Connector is in Retry status
The DNS Record Analysis result reported:
No host record found for SMTP instance "Default SMTP Virtual Server"
No Pointer record found for address 192.168.16.2 (our local server)
Mailfow issues found:
mail acceptance failure.

I know this is not an easy one and I would be grateful if someone would point me in the right direction. I also understand that there could be a lot of info required and I'm only giving a fraction here, so please let me know also what info will help and I'll post.
Many thanks in advance for any help, Manny