improve your Spam Filtering Effective High‑Quality Low‑FP Blacklists

invaluement is a compilation of 3 commercial anti-spam blacklists: (1) ivmURI (2) ivmSIP (3) ivmSIP/24. Subscribers access the data either through direct DNS queries or RSYNC. Access is restricted by IP and requires a local DNS resolver. Start your Free Trial today!


“You also may want to look at the Invaluement IP/URI lists. ...Detection rate is very good ...FP level is extraordinary.”

Axb  March 27, 2015 source

“ivmURI and ivmSIP are good solid and professionally operated lists... high effectiveness... extremely low false positives

The CBL dnsbl  source

Removal Requests
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Research Lookups
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invaluementURI is an anti-spam URI blacklist, similar to surbl.org and uribl.com. Therefore, unlike an “RBL”, and sometimes called a domain blacklist, it actually lists both domain names and a few IPs, which are all found within the clickable links in the body of spams. These domains are generally not seen in legitimate e-mails, except for rare instances when a normally-innocent domain has been hijacked by criminal spammers. However, most ivmURI-listed domains are actually owned by spammers. ivmURI lists many such domains before other domain/URI blacklists, yet with an industry leading low-FP rate. Also, much spam is sent from the MTAs of very large ISPs/hosters and, therefore, cannot be blocked with a senders-IP blacklist without causing massive FPs. But many of those spams can be safely blocked with ivmURI. Start your free trial here.

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free trials are available

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“...decided to also try out Invaluement... We are seeing very positive results... only Spamhaus, which we also pay for a feed, contributes more than Invaluement. The cost for a subscription is low so I think we are going to sign up” (They did!)

Felipe G.  January, 2015 source

“I want to say, the Invaluement RBL is awesome. It is very cheap and almost as good as spamhaus based on my reports so I recommend everyone purchase it... I am not affiliated with the IVM product, just a happy customer.”

Dave J.  September 30, 2014 source

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invaluementSIP is an anti-spam blacklist consisting of IP addresses which either only send spam or which emit an extremely high percentage of spam. Most ivmSIP-listed IPs are from botnets, very elusive snowshoe spammers, or “black-hat” ESPs. Rarer listings include short-term listings of low-volume and normally legit senders who currently have a compromised system that is facilitating the sending of massive amounts of spam. ivmSIP is not trying to be a list-every-botnet blacklist. Therefore, it cannot replace Spamhaus. Instead, it focuses on spammy IPs either overlooked or not yet listed by Spamhaus, and has an industry-leading low FP rate which is comparable to that of Spamhaus’ Zen list. Start your free trial here.


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“...been using them for 3-4 years. A lot of blocking that doesn’t overlap with Spamhaus, very few false positives... Well worth it.”

Dave P.  July 29, 2014 source

“Invaluement... the only ones we have found that are stopping the snowshoe effectively with little if any false positives

Steve  November 22, 2014 source

invaluementSIP/24 is an anti-spam blacklist which preemptively blacklists spammers’ ip ranges or subnets where patterns of spam-sending from those blocks have been detected. Unlike other /24 lists, ivmSIP/24 does a great job of NOT blacklisting those nearby IP ranges which are owned by innocent bystanders. This results in far fewer FPs than other /24 lists. ivmSIP/24 made history by being possibly the first anti-spam list to primarily target snowshoe spammers, even before Spamhaus came out with their CSS list. Actually, ivmSIP was already targeting snowshoe spam before ivmSIP/24. Later, ivmSIP/24 was created to provide an even greater emphasis on listing this very elusive type of spam. Start your free trial here.

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“The invaluement RBL is not expensive and it is awesome... it’s almost as good as Spamhaus Zen.”

D. Jones  March 27, 2015 source

“We’re running invaluement.com on several servers now, and have been downright amazed.”

SFPete  January 21, 2014 source

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SIP & SIP/24 COMBINED:
They make a great “team”. When combined, they are an industry leader in listing spams that are not listed by Spamhaus’ Zen list, yet with an extremely low FP-rate comparable to that of Zen. Don’t be surprised if, in YOUR free evaluation, you find that all other sender’s IP DNSBLs in the industry either don’t list as many of the spams missed by Zen and/or have distinctly more FPs. Previously, only ivmSIP could even approach such a claim. Then, over time, ivmSIP/24 got better and better at having fewer and fewer FPs (which was NOT an easy task for a subnet-oriented list!). Now, working together, they are amazing. Skeptical? See for yourself! Start your free trial today!