get a free invaluement trial

Step 1 of 9

TECHNICAL REQUIREMENT: BOTH access methods (direct query and RSYNC) require that your spam filtering hardware or software is using your own locally-hosted DNS server to provide answers to queries.

(not Google’s DNS, not OpenDNS’s DNS, not your ISP’s DNS, not your hosting provider’s DNS - INSTEAD - it must use your own DNS server that is hosted in your own IP space. This can even be a DNS service running on a remote server or cloud server... so long as their public IPs are exclusively delegated to you.)


  • Some (rare!) custom programmed anti-spam systems rsync the data and then pull that data into a database, thus bypassing DNS lookups.
  • Some systems, like Kerio Connect, can query the DNSBL’s authoritative DNS server directly, eliminating the need for a locally hosted DNS server.

Step 2 of 9

Choose which type of access:

Choose direct query access (w/7-day trial):
  • Direct Query access is usually VERY fast and easy to set up.
  • Direct Query access is more economical for those with LESS than 5,000 mailboxes.
  • However, some still prefer to pay more for Direct Query access for protecting MORE than 5,000 mailboxes, due to the fast and easy implemention, or due to compatibility issues with RSYNC/rbldnsd.

Choose rsync access to rbldnsd-formatted files (w/7-day trial):
  • RSYNC access to rbldnsd-formatted files is required if you are a vendor of distributed anti-spam software or hardware solutions.
  • RSYNC access to rbldnsd-formatted files is more economical for those with MORE than 5,000 mailboxes.
  • However, some still prefer to pay more for RSYNC access for protecting LESS than 5,000 mailboxes, due to the fast performance of rbldnsd.

NOTICE: In the next section, you will have the ability to easily toggle between the RSYNC and Direct Query options with the click of a checkbox, helping you to instantly see the price differences for your declared usage level.

Step 3 of 9

For Direct Query Access, declare your number of mailboxes here:
  Direct Queries    RSYNC

  • Access to all three lists will be provided during the testing phase, even if you ultimately don't choose to subscribe to all of them.
  • Your free trial does NOT commit you to paying for anything. You only pay should you choose to subscribe at the end of the free trial.
  • Our data cannot be purchased for only a subset of your total mailboxes. Rare exceptions to this MIGHT be negoiated upon request and full disclosure, but only when >1M mailboxes are involved.
  • A quarterly paypal payment method (using an automatic PayPal subscription) is also available, but at a higher overall cost per year (approximately 10% more).
  • In the textbox above, please provide an accurate estimate about the number of mailboxes for which you host and/or provide spam filtering services (the total of ALL of them).
  • UNUSUAL USAGE SCENARIOS: If an unusual usage scenario defies counting of mailboxes, enter "0" in the mailbox count textbox above (and explain this in your e-mail). EXAMPLES: (1) whitehat ESP using the data to vet new customers and/or shut down outbound spam, to protect their IP reputation. (2) registrar using the data to comply with ICANN self-monitoring requirements. (3) DNSBL lookup form, similar to, (4) DNSBL lookup form where commercial domain/IP reputation monitoring services are offered, similar to, (5) etc!

Step 4 of 9

IP Permissions

What IP addresses, IP subnets, or IP ranges... should be granted permission for your access the lists.
if RSYNC ACCESS: Enter YOUR public IPs from which your RSYNC requests originate.
if DIRECT QUERIES: Enter YOUR public IPs from which your DNS queries from your locally-hosted DNS server originate.

WARNING: We are NOT asking for your MX records (or their IPs). The public IP(s) that your e-mail traffic goes to, and comes from... are NOT necessarily the same IPs from which your DNS server traffic (or RSYNC traffic) travels . They MIGHT be the same, but don’t assume that! The question above asks about where your “DNS queries (or RSYNCs) ...originate”... nothing in there asks for your MX record IPs (a.k.a. your mail server IPs). If you were about to put your mail server IPs in the box below, and you are not sure that these are the actual public IPs from which your DNS queries (or RSYNC requests) are sent, then you need to re-read step 1.

(Again, entering the entire range or subnet encompassing your actual currently used IP is encouraged, so as to cover all possiblities.)

Step 5 of 9

(OPTIONAL) How did you hear about the invaluement lists?

Step 6 of 9

(OPTIONAL) What spam filtering and/or mail server hardware/software are you using?

The main reason for this question is to custom target the instructions we send. That often facilitates an easier and faster setup experience! Likewise, if you desire Spam Assassin rules, please include in your answer that you use SA, and desire SA rules!. The OTHER reason we ask this is because, if you happen to be using an anti-spam system that ALREADY licenses invaluement, but find that your DIRECT access of our data STILL helps your spam filtering (this actually happens sometimes!), then that situation may entitle you to a large discount in your price. But, without asking, you may not even know (or couldn’t possibly even know?) for sure if your existing solution already licenses invaluement, and we cannot know that if you skip this question. Therefore, you lose that possible discount if we do not have this information.

Step 7 of 9

What is your primary domain name?

Step 8 of 9

Contact Info

Anonymous access to our data is NEVER allowed. Otherwise, spammers and cyber criminals would often request free trials. Therefore, please input your contact information, such as business name, website address, phone number, email address, and address. Please also include YOUR name (and the names and e-mail addresses of others who are involved in this process).

Step 9 of 9


(1) click in the box below and it should “select all“ automatically, (2) copy the text (right click, choose 'copy') (3) paste it into an email, addressed to (just click this email link!), (4) make the subject line “ Free Trial” - which should already be done if you clicked that email address link (5) Verify and adjust/customize the text as needed, especially if this generated text didn't accurately or fully describe your situation. (6) Hit the “send” button in your e-mail program!