i tried that. using different email addresses. all of them are valid. 
still getting the same error. however, when i change the "Cc" to "cc", 
no error was thrown. but only the To: will receive the email. the Cc: 
never get the mail.

any other thoughts on that?

Stuart Dallas wrote:
> That 501 is an SMTP error code, not an IIS error. A 501 error in SMTP
> means "Syntax error in parameters or arguments". Looking at your code, the only
> thing I can think is that it's complaining because both addresses are the same.
> Try changing the CC address to something different from the primary recipient.

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