I have a Server 2003 Standard Edition, and its running Exchange 2003. AD is on another server as the DC, DNS, and DHCP. One of my users is trying to send an email to someone and getting this error message.
server name #5.7.1 smtp;554 5.7.1 DXNS3 18.104.22.168: Message refused. Your host name dosen't match with your IP address: server name