smtp mail server

[yass]

Hi there
i have error wheni send mail from my page

error
(The server rejected one or more recipient addresses. The server response
was: 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.)

containt code MailMessage mail = new MailMessage();
mail.To = "--------------";
mail.Body = "---------";
mail.From = "dev_net@yahoo.com";
mail.Priority = MailPriority.Normal;
mail.Subject = "location";
mail.BodyFormat = MailFormat.Text;

SmtpMail.SmtpServer = "-----------";
SmtpMail.Send(mail);

support never answer got any help.

Regards

[kingaman]

That would be because you have given no username and password for the SMTP server. There maybe a smtpMail.Username or something field you can use... or if not userass@smtpserver might work.

(I think they were solutions i came across in my ASP days)

[kobra]

i have error wheni send mail from my page

You did not state what "your page" is or is in??

H9 mail servers if using SMTP require authentication -

Where you must log in before being allowed to send mail

server is for both incoming and out going

mail.your_domain.com

What application is "your page" in?