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"Could not access 'CDO.Message' Object - Part 7
This solution comes from Justin Bennit and David G.

Thanks Justin and David!
--------------------------
First from Justin
Something I took a while to track down, which wasn't in your troubleshooting section...

I was unable to get to the CDOSYS, with the scary cdo.message warning…

It turned out, my new NAI VirusScan 8.0 software has "Access Protection" in it, which blocks port 25 by default, thereby giving exactly the same error. Telnet to 25 on the local box identifies the problem by not finding the SMTP server installed on my XP client. I reinstalled it, but no avail. Then thought to check this. 10 seconds later, all email apps worked fine!

Unlike products such as Norton Internet Security, no firewall message/warning is given, so I was unaware the port was being blocked.

Regards,

Justin Bennett

Now from David This might be too specific an issue, but I'll mention it anyway. Setting SmtpMail.SmtpServer using the server name gives: 
  Could not access 'CDO.Message' object.
innerexception: The transport failed to connect to the server.
Setting SmtpMail.SmtpServer using the IP address gives:
  Could not access 'CDO.Message' object.
    innerexception: The message could not be sent to the SMTP server. The transport
 error code was 0x800ccc15. The server response was not available
I tracked this issue down to McAfee VirusScan Enterprise 8.0 VirusScan Console, Access Protection, Properties, Port-Blocking tab, Rule:"Prevent mass mailing worms from sending mail" This blocks outbound access to any port 25 on the network. Edit button shows a list of excluded processes to which new processes can be added.

Regards,
DavidG