Blocking Inbound SMTP Traffic to Exchange

At our company we have starting getting a problem with spam maessages. Although our inbound e-mails are scanned by an external company first and then forwarded on, an examination of the headers of the spam reveal that they are bypassing the scanning at appearing directly on the public address of our Exchange 2000 server. I have the IP addresses of the external filters so in theory what I need to do is block all inbound SMTP traffic at the firewall unless it is coming from these two addresses.

However for operational reasons, I'd rather get the Exchange server to do this if possible. I don't mind what happens to mail from 'unwanted' addresses as long as the SMTP packets get dropped. Is it even possible to do this from within Exchange and if so how?

Many thanks
jem99Asked:
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Pete LongConnect With a Mentor Technical ConsultantCommented:
Blocking a Domain or a user From Exchange 2000

1. On the Exchange server open the Exchange System Manager (If you cant find it click Start > Run > type MMC >Press OK. Press Console > Add/Remove Snapin > Add > select Exchange System > Add >At the confirm window Press OK > Press OK)

2. Expand "Global Settings" till you can see "Message Delivery". Right click it and select properties.

3. Select the Filtering Tab.

4. Select add to enter the offending domain or user.

    Syntax ...

    *@domainname.com (Blocks a domain)
    *@*.domainname.com (Blocks a Domain and All sub Domains)
    username@domainname.com (Blocks an individual user)

5. When done click OK.

6. There are three tick boxes at the bottom DONT tick the top one this logs the mail to the Server and will build up over time. Tick the second one, this will filter EMails with a blank header. The Last One (If unticked) will EMail the sender back to say they have been blocked - leave this ticked.

7. The following steps *****SHOULD ONLY BE DONE ONCE!!!!! ******
(The first time you set up filtering)

8. For the next few steps you need to find out which server is "connecting out" - Usually this is The server you are on, however if you have another server running Mailsweeper for example you will need to do this there. Depending on your Setup, On my network its set on the same server.

9.Expand Administrative Groups > First Administrative Group > Servers > Servername > Protocols > SMTP > Default SMTP Virtual Server, and right click it.

10. On the General Tab, Click Advanced. You should see your EMail connection here, Click Edit.

11. Tick Apply Filter "If you cant see Apply Filter" Your on the wrong Server.
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Pete LongTechnical ConsultantCommented:
Hello this question has been open a while please take the time to come back and clean it up.

Closing Questions
http://www.experts-exchange.com/help.jsp#hs5


Best Wishes

Pete
www.petenetlive.com
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