Date: Sun, 24 Mar 2013 18:59:09 +0200 From: Lena@lena.kiev.ua To: freebsd-questions@freebsd.org Subject: Re: Client Authentication Message-ID: <20130324165909.GC913@lena.kiev>
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> How about refusing to > relay mail from addresses in a good DNSBL? Bad idea. Legitimate users connecting from dynamic IP-addresses is normal. DNSBLs list a dynamic IP-address permanently or for long time after a zombied Windows spewed spam from it. Some DNSBLs warn about that explicitly, for example: http://www.spamhaus.org/zen/ | Caution: Because ZEN includes the XBL and PBL lists, do not use ZEN | on smarthosts or SMTP AUTH outbound servers for your own customers | (or you risk blocking your own customers).
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