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Error while sending email using Mail.NET via smtp

I get the following message while trying to instantiate and send an email. I've hidden the actual pwd/user/domain for obvious reasons but have verified with the admin that they are accurate. I'm using my own local domain email address and trying to test sending to hotmail/yahoo account. Any suggestions would be appreciated.

"mailbox unavailable. The server response was 5.7.1 unable to relay for" the hotmail email address I;m testing

public Email()
    {
        SmtpClient smtpClient = new SmtpClient(smtpAdd);
        MailMessage message = new MailMessage(messageFrom, messageTo, subject, body);
        //smtpClient.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;
        smtpClient.UseDefaultCredentials = false;
        NetworkCredential credential = new NetworkCredential(username,password,domain);
        //smtpClient.Credentials = credential;
        //smtpClient.Credentials = CredentialCache.DefaultNetworkCredentials;
        
        smtpClient.Send(message);
    }

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Éric Moreau

have a look at http://www.systemnetmail.com/faq/1.4.aspx

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Sha_Sha_In

Hi,

If you are stillfacing problem, follow these steps one by one, your problem will be resolved,

1.      Open IIS (Start-> Run -> Type inetmgr -> Click OK)
1.1.      Web_Server_Machine_Name -> Default SMTP Virtual Server -> Properties
1.2.      Select Security Tab -> In Operators section, Administrators should exist, otherwise Add Administrators group.
1.3.      Select Access Tab -> Click on Relay -> Select only the list below option -> If 127.0.0.1 does not exists, follow these steps,
1.3.1.      Click on Add -> Select Single Computer
1.3.2.      Type 127.0.0.1 in IP address
1.3.3.      Click on OK -> Click on OK
1.4.      Select Access Tab -> Click on Authentication
1.4.1.      Uncheck Anonymous access
1.4.2.      Check Integrated Windows Authentication
1.4.3.      Click on OK
1.5.      Select Delivery Tab -> Click on Advanced -> Provide following values in fields,
1.5.1.      Maximum hop count - 15
1.5.2.      Full-qualified domain name - Web_Server_Machine_Name.domain.local (Whatever it is...)
1.5.3.      Smart host - SMTP_Server_Machine_Name.domain.local (Whatever it is...)
1.5.4.      Check Attempt direct delivery before sending to smart host checkbox
1.5.5.      Uncheck Perform reverse DNS lookup on incoming messages checkbox
1.5.6.      Click on OK -> Click on Apply -> Click on OK
2.      Restart IIS (Start-> Run -> Type iisreset -> Click OK)
3.      Give write access permissions on "C:\Inetpub\mailroot" folder to the appropriate user depending on operating system type,
For Windows XP/2000 Permissions - Web_Server_Machine_Name\ASPNET
For Windows 2003 Server Permissions - NETWORK Service

Regards,
Sha_Sha_In

abedeenf

ASKER

Thanks for pointing me in the right direction!