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PO.NET - Mail server doesn't send mail through SmtpClient.Send
 

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  1. PO.NET - Mail server doesn't send mail through SmtpClient.Send
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    <p>I wrote a single console application (just a part of a site code, but it must work apart too, and it has the same fault result as inside the site) (C#):</p> <pre><code>MailMessage message = new MailMessage("login@ourDomenInPunycode", "toMail") { Subject = "Hello", Body = "Hello world" }; SmtpClient client = new SmtpClient(); client.Host = "ourIP"; client.Credentials = new System.Net.NetworkCredential("login@ourDomenInPunycode", "ourPassword"); client.Port = 25; client.UseDefaultCredentials = false; client.DeliveryMethod = SmtpDeliveryMethod.Network; client.Send(message); </code></pre> <p>So, isn't to send e-mail should be trivial? But wherever I send mail from local machine through our mail server (just running this console application), the following exception appears:</p> <p>System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: 5.7.1 Relaying to denied (authentication required)</p> <p>If I change the "login@ourDomenInPunycode" data to my own mailbox (at gmail or something else - no matter), all works fine. It also not depend from "toMail" address.</p> <p>So, what could be wrong with our mail server? Any special settings? We use Windows Server 2008 virtualized inside another Windows Server 2008 and Kerio Connect 7 as mail server at virtual Windows Server 2008. All other mail programs like Outlook works well with sending e-mails from our mail server. </p> <p>All articles which I read in Internet about SmtpClient's settings have only these (above) trivial settings and code, nothing special.</p> <p><strong>UPDATE</strong></p> <p>I done some fixes in text above.</p> <p>Here is a part of log of our mail server when I tried to send mail through console application launched from the mail server virtual PC ("mail.ourDomen.local" related to "ourIP" above):</p> <pre><code>Task 215 handler BEGIN Task 215 handler starting SMTP server session begin; client connected from mail.ourDomen.local:49399 Sent SMTP greeting to mail.ourDomen.local:49399 Command EHLO OurMailServer Sent reply to EHLO: 250 mail.ourDomenInPunycode ... Command MAIL FROM:&lt;login@ourDomenInPunycode&gt; Sent reply to MAIL: 250 2.1.0 Sender &lt;login@ourDomenInPunycode&gt; ok Command RCPT TO:&lt;toMail&gt; Sent reply to RCPT: 550 5.7.1 Relaying to &lt;toMail&gt; denied Connection to SMTP server mail.ourDomen.local lost: connection closed by remote host. SMTP server session end Task 215 handler END </code></pre> <p>"Sent reply to RCPT: 550 5.7.1 Relaying to denied" - Why this happened?</p>
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