e-Newsletter Preview Email not sending!

Hello WPMU Dev,

We have activated the e-Newsletter plugin on our website and we have set the settings for using SMTP but when we are creating a Newsletter and we try send a test email to ourselves the email never arrives (even though in the dashboard it says it was sent)...this has happened to us with this plugin on two different websites using WordPress Multisite on two whole different servers testing with multiple emails to preview the newsletter and we are not sure what the problem is...Can someone help us sort this out? and has anyone had this issue before?

Inside the e-Newsletter settings when we click the Test Connection button that email comes to us every time..but not the preview email.

Also, yes we have checked in our junk folders.

We are using the latest versions of WordPress and the Newsletter plugin.