Mailbox unavailable. The server response was: 5.7.1 Unable to relay RSS

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  gurram ramu

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  Mailbox unavailable. The server response was: 5.7.1 Unable to relay

  Feb 23, 2012 05:27 AM|LINK

  hi....good morning

  Could not send mails to external domains like yahoo,gmail from windows 2003 mail server

   I am trying to programmatically send an email to end users based on certain bahaviours (such as forgotton password, etc). But, I am getting the error: 
  
  Mailbox unavailable. The server response was: 5.7.1 Unable to relay for (email address).
  
  I have done some reading about this and it seems that most people are able to fix this error by doing the following:
  
  1) Right click on Default SMTP Virtual Server and select properties 
  2) Select the access tab 
  3) Click the Relay button 
  4) Click the Add button 
  5) Type in your ip address
  
  I have tried this but am still getting the same error. . 
  does anybody have any idea what else i might be doing wrong?? 

  Thanks in Advance.

  • Moved by Mikesdotnetting on Feb 23, 2012 06:24 AM
  • Edited by gurram ramu on Feb 23, 2012 07:38 AM
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  cnranasinghe

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  Re: Mailbox unavailable. The server response was: 5.7.1 Unable to relay

  Feb 23, 2012 06:59 AM|LINK

  Check your from email is valid (valid domain).

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  gurram ramu

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  Re: Mailbox unavailable. The server response was: 5.7.1 Unable to relay

  Feb 23, 2012 07:35 AM|LINK

  Thanks for responce..

      In mail server i have created one domain and also i created some mail accounts inside that domain .in MS-Outlook all mails are sending properly but programatically it displays above error..!.In smtp virtual server i created remote domain also.

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  vinay13mar

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  Re: Mailbox unavailable. The server response was: 5.7.1 Unable to relay

  Feb 23, 2012 07:43 AM|LINK

  hi check the link

  http://forums.devshed.com/net-development-87/error-mailbox-unavailable-the-server-response-was-5-7-1t-315971.html

  Thanks
  V.K.Singh
  
  
  
  • Edited by vinay13mar on Feb 23, 2012 07:44 AM
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  cnranasinghe

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  Re: Mailbox unavailable. The server response was: 5.7.1 Unable to relay

  Feb 23, 2012 08:00 AM|LINK

  U have to make sure that your coding & email configurations are correct. if so your IP might be blocked as spamming.

  http://www.webmaster-toolkit.com/spam-block-list-checker.shtml

  http://www.spamhaus.org/sbl/

  if IP blocked u have wait serveral hours/days...to unblock.

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  dinakaran

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  216 Posts

  Re: Mailbox unavailable. The server response was: 5.7.1 Unable to relay for (email address).

  Feb 23, 2012 08:01 AM|LINK

  Hi,

  Try this functions

  try
          {
              // Create a new blank MailMessage
          MailMessage email = new MailMessage();
  
  
          
          email.BodyFormat = MailFormat.Html;
          email.From = "from@mydomain.com";
          email.To = "to@mydomain.com";
          email.Subject = "test";
          email.Body = "bodycontents";
  
  
         // Set the SMTP server and send the email
                                  SmtpMail.SmtpServer = "localhost";
                                  SmtpMail.Send (email);
  
                                  
                                  
                                  lblMessage.Text = "Your email has been sent";
                          }
                          catch(Exception ex)
                          {
                                                                  
                                  lblMessage.Text = ex.ToString();
                          }