Skip to content

The Passive Spam Block List

Summary

Status: Active
Terms: Free
Zones: 1
Website: psbl.org
Lookup: psbl.org/listing
Removal: psbl.org/remove
FAQ: psbl.org/faq/

Background

psbl.surriel.com, also known as The Passive Spam Block List, is a relatively new blacklist to the DNSBL scene. Like most other blacklists, pbsl.surriel.com uses spamtraps and honeypots to gather it’s listing criteria. pbsl.surriel.com is an IP address based block list, and does not list URI’s or URL’s. At the time of this writing, more than 500,000 emails per day are used as part of the analytics process in determining if an IP address should be listed or not.

While any mail server can and will be listed, like other DNS blacklists, pbsl.surriel.com maintains an internal whitelist of host IP addresses that can never be listed. They also work with the well known dnswl.org to compare their lists to be sure a vetted whitelisted sender can not be listed. Somewhat unique to psbl.surriel.com is that upon listing, the tools provided to you for delisting offer data on how the initial listing was obtained. While the source address of the spamtrap that was sent to will not be revealed, significant information is given to aid in helping an email administrator track down the offending sender, and take action to make sure that a listing is not likely to happen again.

Listing criteria

To become listed in the pbsl.surriel.com zone an email server must send an email to a spamtrap or honeypot address. At that time, the IP address of the sending server will be listed. Virus and bounce messages are filtered out of the system, leaving more than 99% of the listed addresses being confirmed as spam.

Zones

pbsl.surriel.com

Use of this zone is like any other DNS blacklist. Have your email server query pbsl.surriel.com; any positive DNS response correlates with a listing.

Removal Process

Removal from pbsl.surriel.com is one of the simpler processes compared to other DNS blacklists. By requesting removal through the removal form, your IP address will be removed from the DNS database. This process generally takes about one hour. However, care should be taken to look at the listing criteria that was used to determine why it was deemed necessary to list your IP address. While removal is simple, it does not mean that you will not be listed again, if spam is again seen coming from your IP address.

The only other way to be removed from pbsl.surriel.com is through natural expiration. If no spam is seen coming from your IP address to an internal spam trap, in approximately two to three weeks the address will automatically expire from the system. According to pbsl.surriel.com, natural delisting is how more than 99% of their listings are removed. This can be interpreted into this being a high quality list with low false positives. Only aggressive spammers do not bother to work to have their IP address removed from a blacklist. If the majority of pbsl.surriel.com listings are naturally and automatically expiring, it is safe to conclude that the majority of the IP addresses are all spammers.

Related Articles

Related Articles

All
  • All
  • Easy Prey Podcast
  • General Topics
  • Home Computing
  • IP Addresses
  • Networking
  • Online Privacy
  • Online Safety
2020 Privacy, Safety, Cybersecurity Podcasts

Top 20 Cybersecurity Podcasts You Should Listen to in 2020

We’ve seen Twittersphere explode with bite-sized information security (InfoSec) news over the past few years and we’ve…

[Read More]
Managing Credit Cards

Alert! Managing Credit Cards Should be Your Focus.

Managing credit cards is the key to good credit. It's more important than low rates and credit...

[Read More]
Data Breach

Data Breaches: Why You Need to Use a Data Breach Check Tool

Using a data breach check tool is the best way to find out if you have accounts...

[Read More]

Psychopaths and Self-Protection with Mike Mandel

Most of us would not consider ourselves to be an easy target for a predator. But we…

[Read More]

Privacy by Design with Nishant Bhajaria

Data privacy has often been an after-thought in software and platform development. Data breaches have increased consumer…

[Read More]

Surviving a Romance Scam with Debby Montgomery Johnson

Many are resigned to stay silent about the pain of being scammed, but today’s guest helps empower…

[Read More]