"Can you hear me now?"
Looks like I'm receiving several items daily from hqnews@mediaservices.nasa.gov. Nothing today so far, but several yesterday.
Every once in a long while I've had email server problems and one or more listservers sent at just the right time to receive a bounce notice. The better ones try again or send a special query message, but some of them just remove you from the list immediately. That might've happened to you unnoticed, so you might want to simply resubscribe. If you're already in the list I don't think that should create a duplicate.