We have Exchange5.5 server running. Domains were registered by register.com, and our ISP is Globex.
When we want to send email to JC Penney, we get the below error. JC Penney says they didn't block us or anything.
Can anyone tell why this si happinning?
Your message did not reach some or all of the intended recipients.
Subject: RE: JCP
Sent: 7/16/2002 8:03 PM
The following recipient(s) could not be reached:
'firstname.lastname@example.org' on 7/17/2002 8:13 PM
The recipient was unavailable to take delivery of the message
The MTS-ID of the original message is: c=US;a= ;p=NAP;l=NAPEXCH-020717000249Z-1466
MSEXCH:IMS:NAP:NAP_NY:NAPEXCH 3499 (000B09B6) Host unreachable