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The transport lost its connection to the server. - Could not access 'CDO.Message' object.

Posted on 2006-11-12
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Last Modified: 2008-03-03
I’ve written the below basic smtp email function:

----------------------------

MailMessage myMessage = new MailMessage();
myMessage.From = "web@mydomain.edu";
//myMessage.To = "student@hotmail.com"; //> Does NOT Work
//myMessage.To = "invalid@mydomain.edu";//> Does NOT Work
myMessage.To = "valid@tamu.edu";        //> Does Work
   
myMessage.Subject = "TEST";
myMessage.BodyFormat = MailFormat.Text;
myMessage.Body = "TEST";
SmtpMail.SmtpServer = "mail.mydomain.edu";

SmtpMail.Send(myMessage);

----------------------------

It will send a message to a valid email address on myDomain.
It will throw an error for an invalid email on my domain or any email off my domain.
I'm trying to figure out what the difference between these two scenarios are and how to fix it.

I get the error message:
The transport lost its connection to the server.
Could not access 'CDO.Message' object.

I went to http://systemwebmail.com/faq/ and tried the below alternate SmtpServer configurations but still get the same error message.

SmtpMail.SmtpServer.Insert(0, "mail.qatar.tamu.edu");
SmtpMail.SmtpServer = "192.101.101.101";
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Question by:TAMUQITS
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Author Comment

by:TAMUQITS
ID: 17928476
We solved the issue. It turns out our Open Relay Filter was blocking any mail sent to an address outside of our domain.

The mail admin had to white list our applications box and it worked right away.
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DarthMod earned 0 total points
ID: 17964923
PAQd, 500 points refunded.

DarthMod
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