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Exchange 2007 Outgoiing Messages Delayes

We recently installed a new exchange 2007 Server.  We were using an Exchange 2003 Server in the past.

Whenever we send outgoing emails to certain domain names we get an a Delivery Delayed bounce back.

When I look at the queue, there are errors relating to reverse DNS.  Our FIrewall, ISP, and IP's did not change except the internal ip of the new server.  There is no problem getting emails.  Also I noticed that the public IP in the error messages is the main ip of the firewall, and the ip that the smtp traffic comes from is .195.  The server is mail.david-feldman.com.

I put a request with the ISP to add rev DNS entries, but why would this problem surface just by changing servers.

Thank you in advance for any help.

I attached a screenshot of the queue
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1 Solution
Well, if you are using the same IP as before then the only reason I can think of is that on Exchange 2003 you were using a smarthost (sending through your ISP or other server for outbound delivery) whereas now you are sending directly using DNS.

Either that or the public IP has changed, because as you rightly point out, you don't have a rDNS entry for either IP address and that's the cause of the problem.

Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
I would have set the ISP IPaddress inthe forwarders tab and check .... Is there any Admin or any cache passwords saved on the firwall settings and you have recently changed them ....
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