Is there a way to tighten down IMS such that the IMS returns code 550 User
unknown when the
rcpt to: has in invalid user on the Exchange server?
Currently under our configuration, the Exchange server accepts the intended
mail for the stated recipient so long as the domain name matches one of the
<inbound> entries we've added. I've seen many other smtp programs that do a
validation check against its users and not accept mail if a user does not
exist on its system.
What am I missing here?
Thanks in advance