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Exchange 2007 server - My users are getting message delay for many domains

My users are getting many notifications that we e-mail delivery is being delayed to aol, att and cox accounts.

i would like to know what can be causing this

thanks for your help,

Carla
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Gareth Gudger
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teamwork123

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My Domain is not blacklisted ,  the queue is showing about 180 messages retrying for AOL.com
If you double click on the queue and view the individual messages do any of the messages have error codes on them. Example 5.5.3...blah blah
Yes this is the error code : Last Error: 400 4.4.7 Message delayed


another error : 451-4.4.0 "primary address responded 554 - RTB:BB aol postmaster. I already submmited a ticket with them and they say we are not on their black list

i'm having issues sending to ATT, comcast, sbcglobal.net and cox.net

thanks,

Carla
Are you using a smart-host at all to send mail?

Open Exchange Management Console
Expand Organization Configuration
Select Hub Transport and select the Send Connectors tab.
Right-click on the existing Send Connector, select Properties
Go to the Network tab.

Anything configured here?