Exchange Server 2003 on SBS 2003

I am running Exchange Server 2003 on SBS 2003. Is there a way to have the server reject email sent to email addresses that are not real or active on my server?

I have seen many time reply's that state the user is not available on this domain, etc., I would like to get mine to do the same.

Thanks
sschlundtAsked:
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PerarduaadastraCommented:
Enable recipient filtering on Exchange. If I remember correctly, by default the server will generate the appropriate NDR for non-existent users.
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sschlundtAuthor Commented:
Cab you tell me where/how to do this? I have search through the exchange server admin setting and can't find it.
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PerarduaadastraCommented:
In the left pane of ESM, just below the organisation name, click on Global Settings. In the right pane, right-click on Message Delivery and choose Properties. Click on the Recipient Filtering tab and tick the box labelled "Filter recipients who are not in the Directory". Click Apply and OK, and OK your way back out.

Restart the Exchange services and you should be good to go.
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PerarduaadastraCommented:
Whoops, missed out a step...

After enabling recipient filtering in Message Delivery, still in ESM, expand Admin Groups -> Server (your server name) -> Protocols -> SMTP. Right click on SMTP Virtual Server and choose Properties. Under the General tab click the "Advanced" button next to the IP address. Click the Edit button and tick the Apply Recipient Filter check box. Click OK, and OK and Apply your way back out.

This will produce the results you are after.

However, be aware that these changes will make you vulnerable to directory harvest attacks, so Microsoft introduced a hotfix (now a part of Service Pack1) to enable a feature called tarpitting. This slows down the the server's response to such attacks to the point that such attacks take so long to execute that they aren't worth attempting.

Assuming that you have SP1 on your server, open Notepad and type in the following:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SMTPSVC\Parameters]
"TarpitTime"=dword:00000005

This will make the server wait for five seconds between each harvest attack request. Save the file as tarpit.reg; change the file type in Notepad to All Types to enable you to do this. Tarpit.reg.txt won't work!

Double-click on the file to import it into the registry.

Finally, restart the SMTP server service to activate the changes.
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sschlundtAuthor Commented:
Fast response and attention to detail. Great response. Thank you
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PerarduaadastraCommented:
My pleasure.
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