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POHow can i disable the relaying and use my code as an authenticated client?
 

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  1. POHow can i disable the relaying and use my code as an authenticated client?
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    <p>So there are many posts on this error i'm getting. But most deal with IIS. </p> <blockquote> <p>Mailbox unavailable. The server response was: 5.7.1 Unable to relay</p> </blockquote> <p>I have ported my code to console to see if i still get this error, and i do. It would seem as though it's still using ISS as a relay or something even though this is a console application?</p> <p>I have spoken to the Exchange Admin and he is not going to open up the mail server for any relaying or allow my server to do so. So i would like to make my C# code send out the email as a regular authenticated client as if it were outlook. </p> <p>My code below works if i'm sending it to someone within my own domain but not if the recipient is outside the domain. </p> <p><strong>How can i disable the relaying and use my code as an authenticated client so i can send emails to people outside my domain?</strong></p> <p>CODE:</p> <pre><code>static void Main(string[] args) { Console.WriteLine("Sending Mail..."); try { SmtpClient _SMTPServer = new SmtpClient("companymailserver", 587); _SMTPServer.Credentials = new System.Net.NetworkCredential("myusername", "mypassword"); MailMessage _mailMessage = new MailMessage(); _mailMessage.To.Add(new MailAddress("someone@gmail.com")); _mailMessage.From = new MailAddress("myself@mycompanydomain.com"); _mailMessage.IsBodyHtml = false; _mailMessage.Subject = "This is a test"; _mailMessage.Body = "This is the body"; _SMTPServer.Send(_mailMessage); } catch (Exception err) { Console.WriteLine("error: " + err.Message); } Console.WriteLine("Press any key to continue..."); Console.Read(); } </code></pre> <hr> <p><strong>UPDATE #1</strong></p> <p>The strange thing is no matter what credentials i put i get the same 'Unable to relay' error. As if it's defaulting to relay and ignoring my SmtpClient settings.</p>
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    1. UScapdragon
    1. UScapdragon
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    1. COThis is a outbound mail server setting, I don't think there is anything you can do code wise to allow this.
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      1. POHow can i disable the relaying and use my code as an authenticated client?
      1. USkd7
    2. CO@kd7 Why wouldn't i be able to send out mail as a regular SmtpClient without relaying? after all the the Class is called `SmtpClient`. The server allows any authenticated clients to send out emails to anyone.
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      1. POHow can i disable the relaying and use my code as an authenticated client?
      1. UScapdragon
    3. COThis should be possible, somehow. Most mail servers will allow relaying, as long as the email is from a user with a mailbox on the system and the user is authenticated. Otherwise, users would never be able to send email to other companies.
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      1. POHow can i disable the relaying and use my code as an authenticated client?
      1. USCodeThug
 

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