asp.net - 信箱不可用。服务器响应是 : Access denied - Invalid HELO name (See RFC2821 4. 1.1.1)

Question

我正在运行 Windows Server 2008 R2，但收到 smtp 邮件异常:

邮箱不可用。服务器响应是:拒绝访问 - 无效的 HELO 名称(参见 RFC2821 4.1.1.1)

代码隐藏:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim NewMail As New System.Net.Mail.MailMessage
    Dim str1 As String = String.Empty
    str1 = Convert.ToString(System.Configuration.ConfigurationManager.AppSettings("SmtpEmail")) 'abc@example.com
    Dim fromaddress As MailAddress = New MailAddress(str1)
    NewMail.From = fromaddress
    NewMail.Sender = fromaddress
    NewMail.IsBodyHtml = True
    NewMail.Subject = "TEST"
    NewMail.Body = "This is Testing..."
    NewMail.Priority = System.Net.Mail.MailPriority.Normal
    NewMail.To.Add("xyz@example.com")
    Dim SmtpMail As New SmtpClient()
    SmtpMail.Port = 25
    SmtpMail.Host = ConfigurationManager.AppSettings("SmtpServer").ToString 'mail.xyz.com
    SmtpMail.Send(NewMail)
    NewMail.Dispose()
    SmtpMail.Dispose()
End Sub

Answer 1

一定是用户名或密码不对，换个用户名和密码试试看。

还要验证要连接的端口(例如 587 )