Emails to lesser known domains stay in Queue any help?

By imnotorginal ·
I have a Server with SBS 2003 installed on it, and it is running Exchange 2007. Recently emails from users on my network to private company email addresses go to the queue and end up staying there, and never leave. If the same user from the same computer emails @yahoo, @msn, @gmail the emails go thru to the destination.

I have checked and there is no blacklist on the domain or email server. The email addresses for the private companies are emails addresses that we have emailed 100's of times before, so I know it is no on the destinations side. Even my own personal domain that I run off google apps could not get emails from my exchange server. Internet works fine on the server, I am able to access the same domains I am emailing through HTTP, and even access OWA from the mail server to the domains we are trying to email.

In the queue the emails sit there
Status: Active
Next Retry Time: "Blank"
Last Error: "Blank"

Any help or pointing in a direction is greatly appriciated. Any needed info will be provided as requested.

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