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Date:      Sun, 24 Mar 2013 18:59:09 +0200
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:

| 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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