The host information you provided was devoid of an indication of abuse.

Here is what I recieved from you:

from host
(xxxxx.yyyy.uic.edu [128.248.260.270])

please close your open mail relay.

--
user
-------------------
user@complaint.site 
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I could do a DNS lookup on any hostname in your domain, and provide you with 
an analogous complaint. 

I need enough of the header to indicate that xxxxx is in fact relaying. 
Usually this includes the Received: part of the Received: header, as well as 
the timestamp at the end of the Received: header. Not to mention the other 
headers and perhaps the body of the offensive message.
Anything less is not a usable complaint.

All you have succesfully done is told us that you know that xxxxx is in the 
ORBS database (which means that ORBS has notified us), that you know how to 
test SMTP relaying, and that you know where to find instructions on how to 
close open relays for the OS that you determined xxxxx is running, based on 
the header that you failed to include.

Rest assured that we will endeavor to close this relay.
In the mean time, perhaps you should convince your postmaster to block email 
from ORBS listed hosts, if you consider an ORBS listing to be worth the 
electrons it is encoded in.

--
UIC Postmaster incarnated as John Mason - UIC ACCC