Sending email with powershell fails, 5.7.1 Client not authenticated

The error powershell throws at you:

Exception calling “Send” with “1″ argument(s): “The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated”

When using the following:

#Send email message

$smtp = New-Object Net.Mail.SmtpClient($smtpServer)

Needs another line and becomes this:

#Send email message

$smtp = New-Object Net.Mail.SmtpClient($smtpServer)

$smtp.UseDefaultCredentials = $true

Email delivers correctly.