I want to send an email from the serverside of an aspx page based on data su
bmitted by the client. I also need to attach a file to send to the recipient
 of the email.
In Visual Studio debug:
Uploading the file to new directory – no problem
Creating and populating the MailMessage  - no problem
Attaching the file - no problem

SmtpMail.Send(oMM) –gives following exception.

Exception Details: System.Runtime.InteropServices.COMException: The "SendUsi
ng" configuration value is invalid.

Source Error:

Line 35: 			oMM.Attachments.Add(oMA);
Line 36:
Line 37: 			SmtpMail.Send( oMM ); <-- error line in red
Line 38: 		}
Line 39:

Same code in windows app works.
Are there som settings I need? Please suggest solution.

Thanks

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