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POMailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender
 

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  1. POMailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender
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    <p>I know this question has been asked several times, however, after digging through question for past hour an half and not finding any resolution i'm at a bit of a dead end. Also most of these questions refer to Window Server 2000 / Exchange 2003 / IIS 6.0</p> <p>this is the code:</p> <pre><code> var mail = new MailMessage(); mail.From = new MailAddress("Administrator@$#@!.com"); mail.To.Add(to); mail.Subject = subject; var plainView = AlternateView.CreateAlternateViewFromString(body, null, "text/plain"); var htmlView = AlternateView.CreateAlternateViewFromString(body + "&lt;img style=\"text-align: center;\" src=cid:companylogo&gt;&lt;br/&gt;", null, "text/html"); ServicePointManager.ServerCertificateValidationCallback = delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; }; var path = Server.MapPath(@"logo.jpg"); var logo = new LinkedResource(path) {ContentId = "companylogo"}; htmlView.LinkedResources.Add(logo); mail.AlternateViews.Add(plainView); mail.AlternateViews.Add(htmlView); var smtpClient = new SmtpClient(); smtpClient.EnableSsl = true; System.Net.NetworkCredential("Administrator@$#@!.com", "!@#$%^"); smtpClient.Send(mail); </code></pre> <p>I have tried authenticating in the web.config as well</p> <pre><code> &lt;smtp&gt; &lt;network host="192.000.0.001" userName="administrator@%^##.com" password="!@#$%^" port="25" /&gt; &lt;/smtp&gt; </code></pre> <p>SBS 2008 Exchange 2007 IIS 7 SP2</p> <p>I have tried different settings in the IIS SMTP Email settings and Exchange Send Connector.</p> <p>I noticed some other posts had mentioned changing SMTP Virtual settings using IIS 6 manager however I am unable to view these settings in IIS 6. ex. <a href="https://stackoverflow.com/questions/3165721/mailbox-unavailable-the-server-response-was-5-7-1-unable-to-relay-for-abcxyz">Related Question</a></p> <p>I know this is not a question that can be directly answered, however, any input in how I can go about effectively troubleshooting this issue.</p>
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    1. COI don't think the issue is at all related to your code. This is more likely a configuration issue on the Exchange Server. What's weird is that it complains that `administrator@dasdas.com` is not authorized to send an email as `administrator@dasdas.com`. I'd try using your own credentials for a second and see whether the email is sent or not.
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    2. CO@Icarus Yeah that's also what is stumping that I can't even send within the domain, I haven't gotten to the hurdle of trying to send out of domain. I know this ultimately boils down to some issue with exchange and while I am somewhat knowledgeable on 2003, 2007 is a different beast.
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