mailx giving error domain of sender do not exists

Hi ,
mailx is unable to send mail , I am getting the following error

Diagnostic-Code: SMTP; 553 5.1.8 <bc00644@dev-app01-wms.domain.fds>... Domain of sender address bc00644@dev-app01-wms.domain.fds does not exist

Can anyone tell me what can be the possible fix for this

try adding the server on the /etc/npt.conf file.

rdrtx1, thanks for your suggestion , I checked , multiple environment (including those where mailx is working) there are no server informaton here..
There are 3 entries
broadcastclient
driftfile <path>
tracefile <path>
please let me know exactly what is to be added
the server name is dev-app01-wms.domain.fds(say)