Need help with this one, please

Ok. Maybe I am lacking common sense here so please help me out. I received an order which i promptly acknowledged, 3 hrs later my acknowledgment was returned

Your e-mail is being returned to you because there was a problem with its
delivery. The address which was undeliverable is listed in the section
labeled: "----- The following addresses had permanent fatal errors

This was 2 days ago, he paid via Paypal` and he emailed again today to check on the status of his order, (He also sent himself a cc of the email, I guess he knows there are problems) I replied, and it was returned again. No phone number. I'd hate to think how he feels about us not confirming his order, but it will not ship for 2 weeks and I can't get a hold of him
(k. sheldon) Any help would be appreciated!
.

Casey,
At this point, about all that you can do is drop him a card in the mail to the address provided by Paypal. You could confirm the order and explain your difficulty in contacting him in that notification.

Thanx Mike! He just emailed me and confirmed reciept. Darla sent an invoice via Quick books and it went thru. Thanx!