How does DRM handle missing or invalid email addresses when sending emails?

How does DRM handle missing or invalid email addresses when sending emails? DRM looks at the code that generates the email and sends the email to your email client you have chosen on the DRM System Settings>>Email tab. The email will fail to send at the email client level. This happens because DRM looks at the code used to generate the emails, but does not do any validation of the email addresses. So, it is important to have valid email addresses established in advance.