Whenever I sent EM to a friend, it gets bounced. I can send to 10 people and his is picked out and returned or to him only and it is returned. The message I get is:
fromMail Delivery Subsystem <
mailer-daemon@googlemail.com>
to:My EMail Address@gmail.com
dateSun, Nov 15, 2009 at 7:46 PM
subjectDelivery Status Notification (Failure)
hide details 7:46 PM (20 minutes ago)
Delivery to the following recipient failed permanently:
His EMail Address@comcast.net
Technical details of permanent failure:
Probe failed: Illegal envelope To: address (invalid domain name):
His EMail address@comcast.net
Any ideas as to what goes on?

He gets all his mail from other folks.