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Exchange 10 queue backing up with bogus mailings.

I've been trying to figure out how to trace this/stop it.. in 08 exchange queue I'm getting more and more queue backing up with undeliverable mail like the one below 26 of them.  I'm not sure how to trace where these are coming from and best way to stop?  

Identity: FOXS1\520209\2469785
Subject: Undeliverable: Search Anyones Criminal Record Online
Internet Message ID: <73ddbed9-847c-4441-8191-4201649dba07@domain.com>
From Address: <>
Status: Ready
Size (KB): 70
Message Source Name: DSN
Source IP: 255.255.255.255
SCL: -1
Date Received: 1/12/2013 10:46:12 AM
Expiration Time: 1/14/2013 10:46:12 AM
Last Error: 400 4.4.7 Message delayed
Queue ID: FOXS1\520209
Recipients:  garton@portsweld.com
0
dee30
Asked:
dee30
1 Solution
 
Alan HardistyCo-OwnerCommented:
You need to filter invalid recipients.  Presumably you don't have any Anti-Spam software installed.

Basically spammers are bombarding your server with mail destined to addresses that don't exist on your server and your server isn't rejecting the mail, it is accepting them and then realising the addresses don't exist and then sending back an NDR message.

You will need to enable Exchange Anti-Spam:

http://technet.microsoft.com/en-us/library/bb201691.aspx

Then use the following Exchange Management Shell Commands:

Set-RecipientFilterConfig -Enabled $true

and

Set-RecipientFilterConfig -RecipientValidationEnabled $true

Alan
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