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

I get this error when trying to send e-mails with my web app.

System The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

Help will be appreciated.

 

Here is the code...

objClient = New System.Net.Mail.SmtpClient("smtp.gmail.com", 587)
objClient.EnableSsl = True
objClient.DeliveryMethod = Net.Mail.SmtpDeliveryMethod.Network
objClient.Timeout = 20000



objCredentials = New System.Net.NetworkCredential("[email protected]", "**********")
objClient.Credentials = objCredentials
objClient.UseDefaultCredentials = True

objAddressFrom = New System.Net.Mail.MailAddress(strSender)

objMessage.Priority = intPriority
objMessage.From = objAddressFrom
objMessage.Subject = strSubject
objMessage.Body = objPage.PageLayoutEmailPublic(sb.ToString)
objMessage.IsBodyHtml = True

 

I have setup my domain to use google apps and have set cname and mx records.

I can send and receive e-mails using the web inter-phase for gmail with the account [email protected]

 

I realized that google is updating/checking for my MX records for my domain. Perhaps this is the problem.

Thanks for all your help.

 

With Google I believe there SMTP server is setup to listen to a secured line. You may need to set "EnableSsl" to true.