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Archive for February, 2009

The SMTP server requires a secure connection or the client was not authenticated

Posted by zeemalik on February 18, 2009

Problem: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. c25sm1228430ika.11






Public Shared Sub SendEmail()



    Dim Message As New Net.Mail.MailMessage()


    Dim FromEmail As New Net.Mail.MailAddress(“From Email Address”)

    Message.From = FromEmail

    Message.To.Add(“To Email Address”)



    Message.Subject = “Subject of the Email”

    Message.Body = “Body of the Email”

    ‘Message.SubjectEncoding = System.Text.Encoding.UTF8

    ‘Message.BodyEncoding = System.Text.Encoding.UTF8

    ‘Message.IsBodyHtml = False

    ‘Message.Priority = Net.Mail.MailPriority.High


    Dim SmtpClient As New Net.Mail.SmtpClient(“”, PortNo eg: 587 for gmail )

    SmtpClient.EnableSsl = True

    ‘smtp.DeliveryMethod = Net.Mail.SmtpDeliveryMethod.Network

    ‘smtp.UseDefaultCredentials = False


SmtpClient.Credentials = New Net.NetworkCredential(“YourEmailAddress”, “YourEmailPassword”)





End Sub


Note: An important point to note is that you have to set the EnableSSl to True before you set the NetWork Credentials of your SMTP client.

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