So-called millions CDs are commonly advertised in spam. These are CD-ROMs purportedly containing lists of e-mail addresses, for use in sending spam to these addresses. Such lists are also sold directly online, frequently with the false claim that the owners of the listed addresses have requested (or "opted in") to be included. Such lists often contain invalid addresses.In recent years, these have fallen almost entirely out of use due to the low quality e-mail addresses available on them, and because some e-mail lists exceed 20GB in size. The amount you can fit on a CD is no longer substantial.
A number of DNSBLs, including the MAPS RBL, Spamhaus SBL, SORBS and SPEWS, target the providers of spam-support services as well as spammers. DNSBLs blacklist IPs or ranges of IPs to persuade ISPs to terminate services with known customers who are spammers or resell to spammers.
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