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Sorry, I've looked everywhere but I can't find the page you're looking for.
If you follow the link from another website, I may have removed or renamed the page some time ago. You may want to try searching for the page:
I've done a courtesy search for the term Mail Sending Failure for you. See if you can find what you're looking for in the list below:
References: Google search result System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: No such user here Cannot Send E-mail from my live website While sending e-mails using System.Net.Mail.SmtpClient object, developers often meet this error. This occurs because the SMTP server requires authentication to avoid spam relay. The error message is like: Message: Mailbox unavailable. The server… Continue reading »