Bill Healy wrote:

>If so then maybe you should look into a filter that can validate
>delivery addresses before accepting a message.
>
>
>  
>
I would think that just doing virus scanning in a post-data filter on 
the secondary MX should be enough to limit a good majority of 
misdirected bounces that would actually hit a live mailbox.  Perhaps SPF 
would catch much of the remainder?

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