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My college just floated me a horror story regarding mail servers and DNS blacklists. (We maintain the mail servers for our company and its customers.)
He said that DNS blacklists (like e.g. SORBS and Protected Sky) may block an entire C-net of IP addresses after repeated spam offences from one or more IPs in that C-net.
Looking for a reason to be even more wary of blacklists I googled this, but found no mention of it.
Is blacklisting entire IP C-nets an accepted methodology in the world of DNS blacklists?
They can only blacklist the SPAM IP's but not the entire subnet. – manjesh23 – 2016-05-03T09:12:56.040