I am running Xmail server in Windows 2003. When I took SMTP test at MxToolBox.com I am getting an error as
550 Relay Denied. How to fix this error?
SMTPrelay.tab file contains the following.
"18.104.22.168" "255.255.255.0" The syntax shout be as
"<IP><tab><SubMask>" But why I am getting this error?