Im having trouble sending an email to a particular email address, getting a bounce back msg saying unknown domain.
Its a system administration msg so its not getting as far as the isp (BT) its an internal error msg.
I am using host to send all msgs not DNS as i understand this is better.
I can send to the email address from hotmail so i know it workds ok
Using Exchange 5.5 on a NT email server.
Any advise appreciated
Any questions please ask