This RBL is from Spain and lists IPs that have sent more then 5 SPAM messages in the last 6 hours. This is probably a trap email? They also send an email to the owner of the IP in Abuse Feedback Reporting Format (ARF). To get removed from the list you have to use the form available on their website.
Blocked - see http://rbl.dns-servicios.com/rbl.php?ip=XXX.XXX.XXX.XXX
Is the information on our site wrong or incomplete? You don't want us to monitor your blacklist? Or do you operate a similar blacklist? We would like to hear from you!
We keep some statistics on blacklists. Below is the graph for rbl.dns-servicios.com. We test blacklists by asking them to respond to known IP's that are blacklisted and known IP's that can't be blacklisted. Not every blacklist has such IP's, we test them with what is possible. We keep if we get any response or error messages and the response duration. Lower response times are better. These statistics may be useful for email server administrators to pick which blacklist to use.