Realtime Blackhole Lists (RBLs) can be a great tool in your security arsenal. You may not know you’re using them, but all email providers and company email servers leverage these services to verify whether servers and IP addresses are sending spam or other abusive content against a known list of offenders.

These services use a number of methods to compile lists of IP addresses reputed to send spam, mostly populating them using honeypots drawing them in with “poison” email addresses to act as victims.

Continue reading UCEPROTECT: When RBLs Go Bad at Sucuri Blog.

Via Sucuri.net