IMP Worm blacklist: What it is and how to get your domain delisted ?

Imagine pouring time and effort into crafting the perfect email campaign, only to discover your messages are being flagged as spam. Or worse, not delivered at all. If your domain is on the IMP Worm blacklist, this scenario might sound all too familiar. 

In order to demystify the IMP Worm blacklist, let’s learn about how it affects your email deliverability and the actionable steps that you can take to get your domain delisted. 

What is the IMP Worm blacklist?

The IMP Worm blacklist is a database that flags domains and IP addresses associated with spam, phishing, or other malicious email activities. It means that it automatically blocks or marks emails as spam from flagged domains. So yes, being listed can severely damage your domain reputation, leading to email deliverability issues where your messages never reach intended recipients. 

❌ The hidden meaning for businesses? Missed opportunities, lost revenue, and potential harm to brand trust.

How does the IMP Worm affect email deliverability?

Being listed on the IMP Worm blacklist doesn’t guarantee poor email deliverability, but it can still be a red flag. Google and Microsoft, the two largest email providers, are the ultimate gatekeepers for inbox placement, and they ignore over 95% of external blacklists, including IMP Worm. This means that being on this list might not directly impact where your emails land, which is great news.

What truly matters is your domain reputation and how Google and Microsoft perceive your email-sending practices. In fact, a poor reputation, caused by factors like spammy behavior, low engagement rates, or high complaint rates, has a much greater effect on email deliverability than being on an external blacklist. That’s the trick. 

To know where you stand and identify real issues with your email performance, you need to do one and only one thing: test, test and test! Mailreach’s Email Spam Test provides a clear, actionable report showing whether your emails are hitting inboxes or spam folders, with insights tailored for improvements. So if Gmail is blocking your emails for example, you will know it. You’re welcome!

👉 Test your email deliverability now with Mailreach Spam Test!

How to check if your domain is blacklisted by IMP Worm?

To check if your domain is blacklisted by IMP Worm, you need tools that scan blacklist databases and provide accurate results. Nothing more. Here are some tips:

• Use a blacklist checking tool: Platforms like MxToolbox or MultiRBL let you quickly scan multiple blacklists, including IMP Worm. Simply enter your domain or IP, and they’ll quickly generate a detailed report.
• Check directly the IMP Worm list: If IMP Worm provides a public lookup tool, you can search for your domain or IP directly on their website to confirm its status.
• Pay attention to email bounce-backs: Rejected emails often include error codes or messages explaining why. So if a blacklist is involved, these messages will usually mention it, giving you a clear signal to investigate.
• Set up ongoing monitoring: Third-party tools like Postmaster or DNS reputation services can alert you automatically if your domain appears on a blacklist. It’s a win-win situation, as it saves time and ensures you catch issues early.

As you understand it, while being blacklisted doesn’t always impact email deliverability with major providers like Google and Microsoft, staying proactive about your domain’s reputation remains extremely important. The key: regular checks to avoid bad surprises!

Steps to remove your domain from the IMP Worm blacklist

If your domain has been flagged by the IMP Worm blacklist, you need to take quick action:

1. Figure out why you were blacklisted:  Investigate the root cause, as common culprits include spammy email practices, server vulnerabilities, or malware infections. Understanding the issue is the first step to fixing it.
2. Clean up your systems: Scan your servers and email accounts for malware or viruses using trusted tools. Any signs of compromise must be eliminated to prevent further issues.
3. Fix your DNS settings: Ensure your SPF, DKIM, and DMARC records are properly configured, as these settings prove your emails are legitimate and improve your domain’s trustworthiness. Yes, all of that.
4. Submit a delisting request: Go to the IMP Worm blacklist website and follow their delisting process. Provide accurate information about your domain or IP. Be patient—requests can take time to process.
5. Keep an eye on your domain’s status: Don’t forget to regularly monitor your domain using tools like MxToolbox to ensure it’s been removed and stays off blacklists.
6. Warm up your email activity: If your reputation has taken a hit, rebuild it with email warmup services like Mailreach to improve trust with email providers.
7. Stay vigilant with ongoing monitoring: Of course, you will need to proactively test your email deliverability and track your domain’s reputation. Here, regular use of spam tests and blacklist checks is key to be sure to catch problems before they even escalate.

How to prevent future blacklisting

Preventing future blacklisting isn’t complicated: it’s only about staying sharp and proactive with your email practices. 

First, stop sending to bad contacts. If your email list is full of outdated addresses or people who never engaged with your business, you’re inviting trouble. So please, clean your list regularly and stick to double opt-in to make sure every recipient actually wants to hear from you.

Next, protect your domain like it’s your business card. Because it is. Ensure your SPF, DKIM, and DMARC records are properly set up to authenticate your emails, as misconfigured DNS settings make you look like a spammer, even if you’re not.

The real secret weapon? Consistent email warmup. Tools like Mailreach build your reputation with email providers over time by slowly increasing your sending volume and creating positive engagement signals. This doesn’t just improve deliverability: it keeps you off blacklists like IMP Worm, even in an indirect way!

Finally, don’t guess: test. Use a reliable spam test, like Mailreach’s, to see exactly where your emails land and how providers like Google and Microsoft treat your messages. Spot issues early and fix them fast before they affect your bottom line.

Conclusion

Email is the backbone of modern business. If your messages don’t land in the inbox, you’re losing deals, damaging relationships, and risking your reputation. This isn’t just about staying off blacklists like IMP Worm: it’s about playing the long game with email reputation management.

Google and Microsoft don’t care about excuses; they care about how trustworthy your domain reputation looks. Every email you send is either building or breaking that trust. And without the right tools, you’re flying blind.

That’s where Mailreach comes in. With email warmup and spam testing, it doesn’t just keep your domain off blacklists: it keeps your emails in the inbox, where they drive results. No guesswork, no wasted opportunities.

Bottom line: your email reputation is your business reputation. Protect it, manage it, and watch your communication become your strongest asset.

Discover the best email warmup tool for a perfect deliverability