{"id":3569,"date":"2023-11-27T08:57:40","date_gmt":"2023-11-27T08:57:40","guid":{"rendered":"https:\/\/www.warmy.io\/blog\/sorbs-spam-blacklist-how-to-remove-your-ip-from-it\/"},"modified":"2023-11-27T08:57:40","modified_gmt":"2023-11-27T08:57:40","slug":"sorbs-spam-blacklist-how-to-remove-your-ip-from-it","status":"publish","type":"post","link":"https:\/\/www.warmy.io\/blog\/sorbs-spam-blacklist-how-to-remove-your-ip-from-it\/","title":{"rendered":"SORBS Blacklist Removal: What You Need to Know"},"content":{"rendered":"

Every undelivered email is lost revenue. So if your emails aren\u2019t making it into your recipients\u2019 inboxes, you don\u2019t only have a technical issue\u2014you also have a business problem.<\/span><\/p>\n

One of the main reasons why emails don\u2019t reach the inbox is because the sender has been blacklisted. The SORBS (Spam and Open Relay Blocking System) Blacklist, for example, was known as a major blocker of spam and protector of inboxes from suspicious IP addresses. But there\u2019s a catch\u2014<\/span>SORBS officially ceased operations as of June 2024<\/span><\/a>.<\/span><\/p>\n

So why are some servers still treating your IP like it\u2019s from the active SORBS blacklist?<\/span><\/i><\/p>\n

Because, despite SORBS\u2019 closure, old configurations, outdated filters, and legacy systems may still reference your IP as if it\u2019s guilty. SORBS\u2019 reputation precedes it. <\/span><\/p>\n

This guide will walk you through how to check if you were ever listed and what SORBS blacklist removal means now that it\u2019s offline.<\/span><\/p>\n

What is the SORBS blacklist?<\/strong><\/h2>\n

SORBS, short for Spam and Open Relay Blocking System, is a DNS-based real-time blacklist that flags IP addresses and domains <\/span>suspected of sending spam or malicious email<\/span>. It categorized your IP based on *why* it posed a risk, using multiple specialized blacklists <\/span>(let\u2019s talk about more on those in a second)<\/span><\/i>.\u00a0<\/span><\/p>\n

So, for example, let\u2019s say your business sends an email. The receiving servers may check SORBS\u2019s database to see if your sending IP address has been flagged. If it was, your email might never reach the inbox. Or worse\u2014it wouldn\u2019t get delivered at all.<\/span><\/p>\n

Now, since SORBS shut down in mid-2024, this means it no longer maintains or updates any SORBS blacklist data. <\/span><\/p>\n

However, the standards SORBS enforced, like good sending behavior, strong authentication, clean lists, and engagement, are far from outdated. These preventive and corrective steps are still essential for maintaining deliverability today.\u00a0<\/span><\/p>\n

Main types of SORBS blacklists\u00a0<\/strong><\/h2>\n

The categories below are SORB\u2019s blacklists. It sorted IP addresses and domains according to the specific type of risk or malicious activity they were associated with. Here are seven reasons your IPs\/domains got blacklisted.<\/span><\/p>\n

1. Spam blacklists<\/strong><\/h3>\n

This is the \u201cyou sent spam\u201d list. Maybe you didn\u2019t mean to\u2014maybe your account got compromised or your dev team forgot to control how fast you send a large volume of emails. Doesn\u2019t matter. If SORBS saw high volumes of unsolicited email, you were in.<\/span><\/p>\n

2. Open relay blacklists<\/strong><\/h3>\n

Your server was acting like a doormat, letting anyone send mail through it. That\u2019s an open SMTP relay. Spammers love them. SORBS listed them. End of story.<\/span><\/p>\n

3. Trojan\/hacked server blacklists<\/strong><\/h3>\n

If your server got infected and started sending malware, phishing emails, or junk\u2014SORBS flagged it. Whether it was a Trojan or a sketchy WordPress plugin gone rogue, you landed here.<\/span><\/p>\n

4. Dynamic IP Blacklists (DUL)<\/strong><\/h3>\n

SORBS wasn\u2019t a fan of emails sent from dynamic or residential IPs (like those handed out by your home ISP). These are typically and easily exploited. So SORBS listed whole ranges by default\u2014if you weren\u2019t on a proper business-grade setup, this is where you ended up.<\/span><\/p>\n

5. Non-Delivery Report (NDR) blacklists<\/strong><\/h3>\n

Ever send a bunch of bounce-back messages to dead email addresses? If SORBS saw your IP flooding inboxes with invalid NDRs, it assumed you were misconfigured or worse\u2014spoofed.<\/span><\/p>\n

6. Escalation and time-based lists<\/strong><\/h3>\n

SORBS also played the \u201chow bad and how recent\u201d game. Some lists targeted senders who misbehaved in the last 24 or 48 hours. Others flagged repeat offenders who couldn\u2019t seem to clean up their act. Fresh spam? High priority block.<\/span><\/p>\n

7. Zombied\/compromised hosts<\/strong><\/h3>\n

If your IP was part of a botnet\u2014meaning your machine was infected and silently sending spam\u2014SORBS caught it. Welcome to the zombie list.<\/span><\/p>\n

How to check if your IP was blacklisted<\/strong><\/h2>\n

So if your IP was blacklisted back when SORBS was active, that legacy listing might still be dragging down your <\/span>email deliverability<\/span><\/a>.\u00a0<\/span><\/p>\n

As mentioned earlier, former SORBS listings might still appear in cached data or legacy mail server configurations that have not been updated to remove SORBS queries. So here\u2019s how to find out:<\/span><\/p>\n

Use the SORBS website lookup tool:<\/strong><\/h3>\n

Heads up: Since SORBS shut down, this site might not be live anymore\u2014or may only show outdated listings. Still, if it loads, it\u2019s worth a peek.<\/span><\/i><\/p>\n