exchange server 5.5

Mail must originate or terminate locally (on this host), with exceptions made for hosts listed, one per line, in /etc/sendmail.cR. (In this
incarnation, this ruleset does not allow relaying within your domain, except for the hosts listed in /etc/sendmail.cR. Note carefully, you must list fully qualified host names for each host you wish to allow relaying. Simply listing a domain name is not enough. Ideally, it would only restrict relaying from outside your domain. This is particularly useful if you are using mail clients such as MH or Eudora that like to try to find an SMTP relay on the local network to do
outgoing mail submission.)

See this link for the entire description and related code:

http://www.ncf.carleton.ca/ip/freenet/subs/complaints/spam/faqs/spamblock.txt

------ Another possibility ------

"How to Stop Spam Mail Messages from Using IMS Relay"

http://support.microsoft.com/support/kb/articles/q199/6/56.asp

------ Another possibility ------

http://rr.sans.org/email/open_relay.php

------ Another possibility ------

http://glennf.com/spam/sendmail.antispam.html

(REMOVE SPACES from the pasted URLs.)

Best of luck and have a GREAT 2002!

Maxwell

First, make sure that you have loaded the latest service pack for Exchange (SP4). Then, in Exchange Administrator:
1. Click on the Connections object for your site and open (double click) the Internet Mail Connector.
2. Click on the Routing tab.3. Select the "Reroute Incoming SMTP Mail" option.
4. If your domain name doesn't appear under the "Sent to" column, click Add, type in your email domain name, and click the "Should be accepted as inbound" option. Click OK.
5. Click the Routing Restrictions button and select "Hosts and clients that successfully authenticate" checkbox.
6. Click OK all the way out. You'll have to stop and restart the Internet Mail Service for the changes to take place.

Hope this helps!

P.S. - Just in case, you should know that after you do this, if you have any internal hosts (workstations or servers) that are sending SMTP mail from a 3rd party program (i.e., not through an Exchange client), you will have to enable them specifically by IP addresson the routing restrictions tab in order to allow them to send (route) mail through your Exchange server.