[MAILSCANNER] Reverse NDR attack.How to combat ? Any ideas ?

[Venkata Achanta]

>Given the reality of the reverse NDR style of spamming it won't be long 
before
>blind-queue servers are generally regarded in the same light as open 
relays and
>smurf amplifiers. Do yourself a favor and start fixing the problem now 
before
>popular consensus agrees that this is a bad thing and blacklists are set 
up for
>"open NDR relays" which include your server.

Thanks Matt.didnt make sense until it became a reality on my mail servers 
this week. I agree with you 100%. 

Now if i go the route of accepting e-mail for only valid users, how do i 
mitigate the risk of Directory Harvest attack on a setup like mine ?can you 
throw some light on it as well ?

Thanks again.

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