Safe DNSBLs for Safe Filters
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As we discussed in a previous article, allocations of IP addresses (IPv4 addresses) are getting hard to come by, especially for spammers. Because the IP addresses they use quickly get a bad reputation as sources of spam, spammers constantly need fresh IPs that are not yet "burned".
To get around this problem, spammers increasingly now turn to a cheap and plentiful source of IP addresses by hi...
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