The NetDimensions LMS spoofs an administrators' email address when sending messages from the system. Your mail server needs to know this so that email from NetD doesn't end up in SPAM or rejected altogether.
Please consult with your IT Department and have them whitelist the following IP Address for your organization’s mail server.
NetD uses sendgrid.net as a smarthost. NetD points to smtp.sendgrid.net on port 587.
The IP is 184.108.40.206