I am unable to send message to outside domain for particular user. Other domains it is working fine however particular person it is not going on very domain. Others I can send on the very domain.
I am getting following error. There is no NK2 cache file, I have checked in server the mail flow setting is okay.
Delivery has failed to these recipients or distribution lists:
Microsoft Exchange has been trying to deliver this message without success and has stopped trying. Please try sending this message again, or provide the following diagnostic text to your system administrator.