How else can IP addresses be removed from PSBL?
After an IP address has not sent anything to to the spamtraps for a few weeks, it is automatically expired from the database. This automatic expiry is by far the normal way for IP addresses to get removed from the list. Manual removal, using the form above, appears to happen for less than 1% of PSBL’s IP addresses. The other 99% are probably spam zombies that never send out legitimate email directly.
