I am admin to a mixed Exchange 2007/2003 organization. Using an Edge server but also a FrontEnd Exchange 2003 server.
To one particular domain i am having trouble to telnet to their mailserver. As soon as i enter mail from: firstname.lastname@example.org I get the response 501 5.1.8. Bad adress syntax.
It only happens to this domain. All others are working fine.
What am i missing? is tehir config no good, or do i need to change something?
thanks in advance