greylisting

[James Kramer]

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

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