I am getting an error when sending email via asp.net. The error is "Mailbox unavailable. The server response was: 5.1.1...User unknown."
However, the email is getting sent. Why is asp.net returning this error?
I'm using VS 2008, vb.net, running 2.0 framework. This happens regardless of whether I'm testing my application from my local machine or running production version. Also, I can send a batch of emails and get the error for some but not all.
I would like to be able to count of the error messages really being accurate, so this situation is unhelpful to our users, because they will start to just ignore all error messages.
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