We've all been there—waiting to hear back from a reviewer invitation that you sent several weeks prior, only to find out that the potential reviewer now teaches elsewhere, making that email address invalid.
Scholastica gives a heads up when you've invited a reviewer via an out-of-date or invalid email address. You'll receive both an email notifying you that your invitation was not successfully received as well as an error message on the reviewer's invitation status.
Bounced Invitation Email
Bounced invitation status