Our SMTP server requires authentication before you can send an email.
But If your ASP or ASP.Net script is located on our Web Server, you don't need any SMTP Authentication to send an email.
Below is the code examples
<system.net>
<mailSettings>
<smtp deliveryMethod="Network" from="your_email_address">
<network enableSsl="false" host="your_smtp_host" port="587" userName="your_email_address" password="your_email_address_password" />
</smtp>
</mailSettings>
</system.net>
You need a fairly clear reference depending on the SMTP email method and the website platform you are using.