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Thanks Chris and Adam. Did have a DNS record, but not a reverse record. Confirmed with AOL via phone with help of the site Adam sent. That's why I split the points. Now just have to wait for XO to actually change the rDNS record which is taking forever.
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I have Windows 2003 SBS. I recently changed my Static IP address of my Exchange Server. After the change, and running CIECW, I am having an issue with messages stacking up in the SMTP connector Queue. The biggest issue seems to be that no emails will go to AOL or Comcast. But, a few others exist also. The vast majority of email is going out though. Any ideas on why these few addresses would have emails stacked up in the queue? I am not getting any RBL messages. 
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I have Windows 2003 SBS. I recently changed my Static IP address of my Exchange Server. After the change, and running CIECW, I am having an issue with messages stacking up in the SMTP connector Queue. The biggest issue seems to be that no emails will go to AOL or Comcast. But, a few others exist also. The vast majority of email is going out though. Any ideas on why these few addresses would have emails stacked up in the queue? I am not getting any RBL messages. 

SMTP Connector Queue stacking up after changing IP address

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).