How do I know if an email address sent to is invalid? Do I see a rejection somewhere? I did a test with a known invalid, and didn't get any feedback.

To further describe the issue ... we're ready to a mass emailing to our class ... across 150 or so email addresses, of which we're not sure if the addresses are still valid. If we don't see a rejection on send, we'll have no idea if we actually got to the person.

Don,

Here is a view of Class Creator's FAQs. Info regarding invalid emails is found under 7. QUESTIONS ABOUT EMAIL, click on that link and scroll down to Question 12.

I included a quick view of where the notification shows on our sites. It is called a bounceback.

http://screencast.com/t/r9qCdsnLU3S6