What is the PSBL (Passive Spam Block List) and how does it work?

Marketer from Email Geeks explains that PSBL has shut down at least once in the past and hadn't heard it mentioned for quite some time, but it looks to be up and running now.

Email marketer from rfc-clueless.org responds that while PSBL isn't a major blocklist, being listed indicates issues with email sending practices and should be investigated.

Email marketer from mail-server-help.org shares that PSBL is not as widely used as some other blocklists, so being listed on it may not have a drastic impact on deliverability, but it's still important to monitor and address any listings.

Email marketer from Reddit user explains PSBL is more likely to be used by smaller ISPs and email providers than larger ones. Being listed could affect deliverability to these smaller networks.

Email marketer from StackOverflow states to avoid PSBL listings, ensure proper list hygiene, implement double opt-in, authenticate email, and monitor sending reputation.

Expert from Email Geeks shares that they thought it was under new management and admits to not realising it had come back online.

Expert from Word to the Wise responds that the impact of being listed on PSBL varies, but because it isn't used by major ISPs as much as other blocklists, the impact on deliverability is usually minimal. However, it still indicates that you are hitting spam traps, which is a problem.

Expert from Spam Resource details that the primary criterion for listing on the PSBL is sending unsolicited email to their spam traps. These are email addresses specifically set up to receive spam, ensuring that only spammers are added to the list.

Expert from Email Geeks explains that PSBL has been around for a long time and involves being listed if you hit their traps. If the listing persists, it indicates list hygiene problems. The list isn't broadly used by many ISPs and its old-school methodology may not be safe for big ISPs, as it could block major webmail providers and bulk sending platforms.

Expert from Spam Resource explains that PSBL (Passive Spam Block List) is a DNSBL that lists IP addresses that have sent spam to their spam traps. It's designed to be easy to get on and easy to get off, reflecting a 'forgive and forget' approach.

Expert from Email Geeks states he was expecting to find it 10 years dead, heh.

Documentation from SURBL states that the PSBL lists IPs that send spam to their traps, which are unadvertised email addresses used to catch unsolicited bulk email.

Documentation from DNSBL.com explains that PSBL is a real-time list of IP addresses that have sent unsolicited email to one or more addresses in the Passive Spam Trap Project. It's designed to be easy to get listed on and easy to get off, encouraging prompt attention to abuse problems.

Documentation from Spamhaus explains that while PSBL's effectiveness can vary, it serves as an indicator of potential spam activity and helps identify senders with poor list hygiene or compromised systems.

Documentation from URIBL explains that PSBL delisting is automatic after a period of no spam being received from the IP address. The listing duration varies depending on the frequency of detected spam.