[Exim] SPAM from DHCP users

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Autor: Segree, Gareth
Data:  
Para: 'exim-users@exim.org'
Assunto: [Exim] SPAM from DHCP users
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Is there some how that I can use exim to verify the host sending a mail in
an attempt to block spammers.
They connect to my mail server and type something like.

Helo compuserve.com

Yet their address is adsl1.earthlink.xxx.xxx.xxx.xxx


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