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POSmtpClient won't authenticate when inflated from web.config
 

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    <p>When using the system.net/mail web.config settings to configure my SmtpClient, it fails to deliver emails, with an "protocol error" described best by Base64 encoding and authentication problems:</p> <p>Example:<br> With the following Config</p> <pre><code>&lt;system.net&gt; &lt;mailSettings&gt; &lt;smtp from="email@server.com"&gt; &lt;network host="servermail.outsourced.com" port="2525" defaultCredentials="false" userName="username" password="password"/&gt; &lt;/smtp&gt; &lt;/mailSettings&gt; &lt;/system.net&gt; </code></pre> <p>And the Code:</p> <pre><code>var tmp = new SmtpClient(); MailMessage msg = new MailMessage(); msg.Subject = "test"; msg.From = new MailAddress("me@server.com"); msg.To.Add(new MailAddress("me@server.com")); msg.Body = "test"; tmp.Send(msg); </code></pre> <p>Produces the error message:</p> <pre><code>System.Net.Mail.SmtpException: The server committed a protocol violation The server response was: UGFzc3dvcmQ6 at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException &amp; exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) </code></pre> <p>However, in the following code where I manually set all the properties, the code runs without exception and the email is delivered.</p> <pre><code>var tmp2 = new SmtpClient("servermail.outsourced.com", 2525); tmp2.Credentials = new NetworkCredential("username", "password"); tmp2.UseDefaultCredentials = false; MailMessage msg = new MailMessage(); msg.Subject = "test"; msg.From = new MailAddress("me@server.com"); msg.To.Add(new MailAddress("me@server.com")); msg.Body = "test"; tmp2.Send(msg); </code></pre>
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    1. COIf you decode UGFzc3dvcmQ6 you get "Password:" so there's a problem with your authentication apparently. I've tested this myself without any problems. Possible duplicate: http://stackoverflow.com/questions/2380531/problem-in-sending-mail-with-smtpclient
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    2. COThat was my initial suspicion, except that the same credentials produce an error when set via the web config, and work when set using code.
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    3. COWhat is the mail server in use?
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