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I'm hoping after a month of trying to resolve this with no success, this site will be my saviour?

I have an aspx page running on the development server built in to visual web dev 2010.

I keep getting "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required"

This always happens on this line: SMTPServer.Send(myMessage)

my web.config: (the password is correct, I have just hidden it here for obvious reasons)

                <network defaultCredentials ="false" host="" port="587" userName="[DELETED]" password="********" />

code behind:

'create an SMTP client object
        Dim SMTPServer As New System.Net.Mail.SmtpClient(host)
        'configuration for the Google mail server
        SMTPServer.Host = host
        SMTPServer.Port = port
        SMTPServer.EnableSsl = True
        SMTPServer.DeliveryMethod = Net.Mail.SmtpDeliveryMethod.Network
        SMTPServer.UseDefaultCredentials = defaultCredentials
        SMTPServer.Credentials = New System.Net.NetworkCredential("username", "password")
Updated 2-Jan-11 0:30am
#realJSOP 2-Jan-11 6:22am    
When you have code snippets surrounded by <pre> tags, make sure you uncheck the "Ignore HTML" box when entering your question.
OriginalGriff 2-Jan-11 6:31am    
...And don't post your email to any public forum, unless you really like spam!

1 solution

I tried this and it worked :

Dim Email As New System.Net.Mail.MailMessage("", "")
Email.Subject = "test subject"
Email.Body = "this is a test"
Dim mailClient As New System.Net.Mail.SmtpClient()
Dim basicAuthenticationInfo As New System.Net.NetworkCredential("myUsername", "myPassword")
mailClient.Host = ""
mailClient.Port = 587
mailClient.EnableSsl = True
mailClient.UseDefaultCredentials = False
mailClient.Credentials = basicAuthenticationInfo

Your Line
SMTPServer.Credentials = New System.Net.NetworkCredential("username", "password")

Shouldn't "username" and "password" just be username and password?

Share this answer
Manfred Rudolf Bihy 2-Jan-11 9:33am    
I can't see where he's reading the mailsettings but going by the config file content wouldn't it be "userName"?

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