我创建将电子邮件发送到电子邮件帐户的一种形式，用下面的code。

I have created a form to send email to an email account and used the following code.

       Dim client As New SmtpClient()
        Dim emailmessage As New MailMessage()

        Dim emailfrom As New MailAddress(txtEmail.Text)

        emailmessage.Subject = "Web Submission"
        emailmessage.Body = "Web submission received from " & txtName.Text & ". Phone no: "     & txtPhone.Text & "."
        client.Host = "localhost"
        client.Port = 25
        emailmessage.From = emailfrom
        emailmessage.To.Add("info@test.com")

        client.Send(emailmessage)
        lblMessage.Text = "Thank you, we will contact you soon"

我使用IIS EX preSS运行我的项目。我知道，IIS EX preSS犯规支持SMTP，如果我是正确的。但是，如果code是正确的，应该正常运行。反正我发表我的网站通过.NET发布工具，我的GoDaddy的帐户。当我尝试从形式发送邮件我收到以下错误消息。

I am using IIS express to run my project. I know that IIS express doesnt support smtp, if I am correct. But if the code is correct it should run properly. Anyway I published my site through .net publish tool to my godaddy account. when I try to send email from the form I am getting the following error message.

邮箱无法使用。服务器响应为：5.7.1无法中继info@test.com

Mailbox unavailable. The server response was: 5.7.1 Unable to relay for "info@test.com"

Dim msg As New MailMessage()
        msg.To = "test@gmail.com"
        msg.From = "test@gmail.com"
        msg.Subject = "test"
        'msg.BodyFormat = MailFormat.Html
        msg.BodyFormat = MailFormat.Text
        msg.Body = "hi"

        SmtpMail.SmtpServer = "localhost"

        SmtpMail.Send(msg)
        lblMessage.Text = "An Email has been send to " & "test@gmail.com"

我尝试了上面的code，仍然它不工作。我只是无法弄清楚我在做什么wroong这里。我记得我曾经得到这个工作的某个时候回来。但我不记得如何。

I tried the above code and still its not working. I just cant figure out what I am doing wroong here. I remember I used got this working sometime back. But I cant remember how.

推荐答案

您丢失SMTPSERVER凭证

Your missing SmtpServer Credentials

        client.Credentials = New Net.NetworkCredential("username@gmail.com", "password")

如果不是这则请设置您的SMTP虚拟服务器，如图例如在http://$c$cbetter.com/petervanooijen/2006/04/05/using-localhost-as-mailserver-5-7-1-unable-to-relay-for-xxx/

If not this then please configure your smtp virtual server as shown in example http://codebetter.com/petervanooijen/2006/04/05/using-localhost-as-mailserver-5-7-1-unable-to-relay-for-xxx/