Quoting Steven Jones <[EMAIL PROTECTED]>:

> Our site is being constantly "hit" by spammers using bruteforce tactics
> looking for valid users.

*snip*

> suggestions please?

Steven (and others),

you may find this document to be very helpfull:
http://slett.net/spam-filtering-for-mx/

It does a great job at explaining the different methods to reject mail at the
SMTP level.

joost


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