Invaluement is a combination of 3 DNSBLs that can be used as an "add on" in most email and spam filtering systems. Our data pinpoints the most elusive spams that often slip past many filters, where those spams are also missed by other DNSBLs. If you manage your own mail server, then you can most likely benefit from using invaluement as a sort of plugin to your existing spam filtering system! The setup time for invaluement is typically less than 10 minutes, it typically integrates directly into your existing spam filter, and requires no hardware or software installation. The pricing is very affordable, and we offer a free 7-day trial. When our two IP blacklists (ivmSIP & ivmSIP/24) are combined, they are an especially excellent supplement to Spamhaus since they block more spam that is missed by Spamhaus than all other DNSBLs in existence, with the only exceptions being certain other DNSBLs which have significantly more false positives! Our ivmURI list is likewise a top-tier domain/URI blacklists since it also blocks many elusive spams before any of the domains found in those spams are blacklisted elsewhere, while also having an industry-leading *low* FP rate. Invaluement began in 1996 under the name “PowerView Systems” and originally specialized in web hosting/design and software development. Later, in 2004, our focus shifted strongly towards spam filtering and e-mail security services, and the name was eventually rebranded “invaluement”. In 2007, the invaluement blacklists were launched. Since then, the invaluement customer base has grown to many hundreds of subscribers. There is also a high-quality mail hosting and spam filtering component, which is offered on a limited basis. That keeps our "finger on the pulse" of the day-to-day routine experienced by e-mail admins, who are our typical anti-spam list subscribers. We are “one of them!” Yet our spam filtering services are limited by locale so as to not compete directly with our DNSBL subscribers’ businesses.