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Exchange 2007 Outside Email Stuck

We have a new SBS 2008 server running Exchange 2007. I have set up Internet mail flow, and now cannot send to ANY outside addresses. From inside the domain I cannot telnet to a valid domain that I know is good. From outside the domain, I can telnet to this mail server perfectly. The problem I believe is with the send connector. I am receiving email fine, just can not send to outside recipients. All mail sent outside gets stuck in the Queue with the error: 451 4.4.0 primary target IP address responded with: "421 4.2.1 Unable to connect....l

Any ideas would be appreciated.
ABSAdmin
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absadmin
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absadmin
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Glen KnightCommented:
OK, first thing have you run through all the wizards in the SBS console?

Secondly, have you configured forwarders on your DNS Server? In the DNS Console, right click the server and select properties under the forwarders tab, enter your ISP's DNS servers here.

Make sure the SBS server uses only it's own IP or 127.0.0.1 for DNS, there should be no other entries in the network card configuraion.

Have you disabled IPv6? If so, re-enable it.

Then finally, in the Exchange Management Console under Server Configuration right click the Server and select properties, under the External DNS Lookups select Use these DNS Servers, enter your ISP DNS servers here too.

Then ni Organisation Configuration > Hub Transport > Send Connectors, right click  Windows SBS Internet Send and select properties, under Network tab put a check the box that says "Use the External DNS Lookup settings on the Transport Server"
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Glen KnightCommented:
Oh, and then restart the Microsoft Exchange Transport service.
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absadminAuthor Commented:
demazter, I have done all of those things. Email was working fine earlier today, then was working on my remote settings, and all this happened. I am receiving mail with mx records, A record, and PTR records to mail.mydomain.com. However, the DNS host, is routing my incoming mail through a secrurance spam filter server, then forwarding it to me.

I have been attempting to set up an outbound mail. I want all outbound mail to use smtp.mydomian.com. The DNS host has added an A record and PTR to my external IP address, and my ISP has added an RDNS to smtp.mydomian.com to point to my external IP Address.

Regardless of the Exchange settings, should I still not be able to telnet to another exchange server outside of my domain? I have another domain that I manage, with Exchange 2003. From any connection outside of my small business server, I can telnet to that domain and get a connection. From inside my SBS domian, I cannot telnet to the same mail server or any other.

Any ideas?

Thx: absadmin
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