# Spam & Blacklists

Protect your sender reputation with spam prevention and blacklist recovery

**What Is the Spamhaus Blacklist and What Does It Do to Your Email Deliverability?**  
Spamhaus can kill your email deliverability overnight. Warmy's 2026 research breaks down every list, what triggers them, and…  
[Read more](https://www.warmy.io/blog/email-spam-blacklists/spamhaus-blacklist-email-deliverability-report/)

**SURBL Blacklist: What Is It, Why You Get Listed, and How to Fix It**  
This SURBL blacklist report by Warmy.io discusses what triggers a SURBL listing, how to check your domain, and…  
[Read more](https://www.warmy.io/blog/email-spam-blacklists/surbl-blacklist-report/)

**The Barracuda Reputation Block List: What Every B2B Email Sender Must Know**  
The Warmy Research Team breaks down how the Barracuda Reputation Block List works, what triggers an IP listing,…  
[Read more](https://www.warmy.io/blog/email-spam-blacklists/barracuda-blacklist-report/)

**Is My Email Blacklisted? How to Check, Fix, and Prevent Blacklisting in 2026**  
Find out if your email is on any email blacklist. Check your status across 100+ RBLs and learn…  
[Read more](https://www.warmy.io/blog/email-spam-blacklists/is-my-email-blacklisted/)

**Email Deliverability 101: How to Avoid Spam and Reach the Inbox**  
A major problem many email senders face when communicating via email is that their emails do not reach…  
[Read more](https://www.warmy.io/blog/how-to-get-your-email-into-the-inbox/)

**What is a Spam Trap and How to Avoid It?**  
Spam traps are decoy email addresses set by ISPs and anti-spam organizations to catch senders who use bad…  
[Read more](https://www.warmy.io/blog/what-is-a-spam-trap/)

**COB Meaning in Email: What It Stands For, What Time It Refers To, and How to Use It**  
Key takeaways: COB stands for “Close of Business” which is a deadline shorthand in email meaning “by the…  
[Read more](https://www.warmy.io/blog/cob-meaning-in-email/)

**Is Your Cold Email Template Getting You Marked as Spam?**  
When it comes to cold outreach, many marketers and sales teams focus on the quality of the email…  
[Read more](https://www.warmy.io/blog/is-your-cold-email-template-getting-you-marked-as-spam/)

**Words That Trigger Spam Filters | How to Fix Them**  
Spam trigger words are words and phrases like “Free,” “Act Now,” or “Guaranteed” that email spam filters flag…  
[Read more](https://www.warmy.io/blog/words-that-trigger-spam-filters-and-how-to-fix-them-with-a-template-checker/)

**Email Blacklist Impact on Deliverability: How Gmail, Outlook & Yahoo Really Filter Senders**  
Yes. If you’re on the wrong blacklist, your emails may be rejected even before the inbox even has…  
[Read more](https://www.warmy.io/blog/are-blacklists-killing-your-emails-a-deep-dive-into-how-they-influence-email-providers/)

**How to Avoid Email Blocks: Lessons from MS365’s Research**  
Email deliverability—crucial yet often elusive goal for businesses aiming to connect with their audience. But there’s a harsh…  
[Read more](https://www.warmy.io/blog/how-to-avoid-email-blocks-lessons-from-ms365s-deliverability-research/)

**Understanding ESP Blocks: Causes, Types, and Prevention**  
Predictions show that by 2027, there will be 408.2 billion emails sent per day. What does this mean?…  
[Read more](https://www.warmy.io/blog/understanding-esp-blocks-causes-types-and-prevention/)