troubleshooting Question

event id 4006 on SMTP service, cant send to certain email address

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bigbem asked on
Microsoft IIS Web ServerEmail ServersEmail Protocols
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I am having problems sending emails to certain email addresses.  AOL.com and Optonline.com.  My firewall is not blocking any traffic on port 25.  All other account send fine and i can receive email from both domains as well.  In the even log I see error event id 4006  "Message delivery to the host '64.12.138.88' failed while delivering to the remote domain 'aim.com' for the following reason: The connection was dropped by the remote host."  Any ideas on why this is.  I am running GFI mailessentials 12 on a stand alone server that is filtering SPAM for a 2000 and 2003 exchange server setup.  The error is coming from the GFI machine.
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