greylisting

[Bill Horne]

James Kramer wrote:
> I set up greylisting for my mail server and recall once reading that
> it is possible to set up an effective spam blocker by changing the top
> MX record on the dns server to point to a bad address.  The second
> priority MX record points to the correct mail server.  The article
> claims that most spammers attack only the primary mx record.  Has
> anyone tried this?
>
> Jay
>
Jay,

Sorry, that's not an effective solution: many spammers purposely target 
backup MX machines, since they're often not hardened as much as the primary.

Bill

-- 

E. William Horne
William Warren Consulting
http://www.william-warren.com/
781-784-7287


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