We have a MS Exchange 5.5 server running on Win NT4. Problem I’ve encountered is something is sending emails through our server to verious domains with the originator as <>. Eventually the message will time out and send me a mail failure notice. When I go into Exchange Admin and look at the message in our IMS Queue, it states the host is unreachable. The address will have our domain with one of our users address, but will be trying to send the message to other various domains. Originator alwaysshows up as <> with nothing between the signs. The log files don’t ever show these messages, but if I pick one of our users names that is listed in the message in the IMS queue I have found some strange email addresses. The email address is a stringof #’s and alpha characters seperated by periods @aol.com. I have submitted test for an open relay to ordb.org multiple times and they come back with us having no open relays. HELP!
