Barracuda Blacklist: What It Is & How to Remove Yourself

Being Barracuda Blacklisted is sure to affect your email deliverability and sales like nothing else. Learn what it is and how to avoid it in this blog.
It's one of the most dreaded emails a SaaS company can receive - being listed as "blacklisted" on Barracuda! It can send shivers down your spine and make you feel like an instant failure.

But there is no need to panic - by understanding what Barracuda blacklisting is, how to identify it, and most importantly, how to fix it, you'll be able to safeguard your email warm-up efforts and turn this potentially disastrous situation into something far less terrifying.

Read on!

What is a Barracuda Blacklist?

Barracuda Blacklist is an online blacklist service provided by Barracuda Networks that stops suspicious emails from being delivered to an inbox.

It is designed to protect email recipients from malicious emails and other threats that can cause significant damage to a company or a person.

This kind of list is known as the Domain Name System blocklist (DNSBL).

The Barracuda Blacklist is a real-time database that is constantly updated, making it one of the most reliable sources of information available to companies.

How Does The Barracuda Blacklist Work?

The Barracuda Reputation System determines an IP address' reputation. The Barracuda Reputation system automatically adds the IP addresses sending spam to the Barracuda Reputation Block List (BRBL).

After receiving a message, the system examines the connection to assess whether the host is an open relay or a node in a spam-sending botnet. If so, the Barracuda Reputation Block List is promptly updated to include the connecting host's IP address.

Barracuda Central also keeps a database of "bad" URLs in addition to IP address reputation, allowing it to block emails containing one of these URLs instantly.

The spam filter can easily distinguish between spam and legitimate messages using the IP and URL reputation data — both legitimate and spam messages.

How The Barracuda Blacklist is Maintained

The Barracuda blacklist is maintained by a team of security experts who monitor network traffic and identify sources of spam, malware, and other malicious activities.

It is updated in real-time as new threats are detected, and it is used by Barracuda security solutions to block traffic from known bad actors.

How The Barracuda Blacklist Can be Used

Companies can use the Barracuda blacklist to block emails and other network traffic from known bad actors, reducing the risk of cyberattacks.

The blacklist can be integrated with a wide range of security solutions, including email security gateways, firewalls, and intrusion prevention systems.

How The Barracuda Blacklist Works With Other Security Solutions

It can be used with other security solutions to protect against cyber threats.

For example, it can be used with email security gateways to block spam and other unwanted emails or intrusion prevention systems to block malicious network traffic.

How The Barracuda Blacklist is Updated

The Barracuda blacklist is updated in real-time as new threats are detected.

The blacklist is constantly monitored by Barracuda security experts, who analyze network traffic and identify sources of spam, malware, and other malicious activities.
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How to Remove Yourself From The Barracuda Blacklist?

Errors happen, and you can discover that the Barracuda blocklist now includes your sending domain or IP address.

Although it will take some effort to fix the problem, this is not a death sentence for your email deliverability. This is due to the rugged nature of the Barracuda blacklist removal process.

Most IP addresses are listed as a result of directly sending spam or viruses to the Barracuda Reputation System’s detectors.

The Barracuda Reputation System detects spam using honeypots, particular addresses created to receive only spam that does not belong to any real user, and through analysis of captive spyware protocol activity.

You ended up on a blacklist due to sending a hazardous email or having ideal spam traps (honeypots) in your contact information.

If you have an email address for a honeypot, it implies that someone bought contacts or harvested emails from the internet at some point.

The following steps will help to remove your email address from the blacklist:

Check if You Are Listed

  • Type your email server's IP address into the "Email Server IP Address" column. Consult your network administrator if unsure about the email server's IP address.

  • Type your email address and phone number into the respective fields, then in the "Text in Image" field, type the text from the verification image.

Identify The Reason For Blacklisting

You can do this by checking the Barracuda Reputation System, which provides information on why your IP address was blacklisted.

This system allows you to search for your IP address and view its reputation score and any details on why it has been blacklisted.

If you understand why your IP was blacklisted, you can take the necessary steps to resolve the issue and request removal.

Resolve The Issue That Caused The Blacklisting

Once you have identified the reason for the blacklisting, you need to take steps to resolve the issue.

For example, suppose your IP was blacklisted for sending spam. In that case, you should review your email policies and practices, remove any email addresses marked as invalid or inactive, and implement email authentication protocols like SPF, DKIM, and DMARC.

Request Removal

After you have resolved the issue that caused the blacklisting, you can request removal from the Barracuda blacklist.

You can do this by filling out a removal request form on the Barracuda website, providing details on why your IP was blacklisted and the steps you have taken to fix the issue.

Wait for Confirmation & Verification

Once you have submitted your removal request, you must wait for confirmation and verification from Barracuda.

This can take up to 24 hours, so be patient and check your email regularly for updates.

How to Avoid The Barracuda Blacklist

It’s no secret that a Barracuda Blacklist can hurt your online reputation and business. If you’ve been blacklisted, you know how frustrating it can be.

You must investigate why your server's IP address was blacklisted to remove yourself from the Barracuda BlockList. If you don't, your removal effort will be ineffective.

Fortunately, there are things you can take to do to avoid being blacklisted:

Implement Strong Email Authentication Protocols

One of the most important ways to avoid the Barracuda blacklist is to implement robust email authentication protocols, such as SPF, DKIM, and DMARC. These protocols verify that the email sender is legitimate and help prevent email spoofing and phishing attacks.

SPF (Sender Policy Framework) allows email recipients to verify that incoming messages from a domain are sent from authorized IP addresses.

DKIM (DomainKeys Identified Mail) verifies that the domain owner sent an email message and hasn't been altered in transit.

DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email validation system that uses SPF and DKIM to prevent email spoofing and phishing.

Use a Reliable Email Service Provider

Another way to avoid the Barracuda blacklist is to use a reliable email service provider.

A good email service provider will have robust security measures in place to prevent spam and malicious activity and will be able to help you quickly resolve any issues that arise.

When choosing an email service provider, look for one with advanced security features like spam filtering, antivirus protection, and encryption. You should also check the provider's reputation to ensure its track record of delivering high-quality email services.

Follow Email Best Practices

To avoid the Barracuda blacklist, you should follow email best practices like not sending unsolicited emails, regularly removing inactive or invalid email addresses from your list, and using clear and descriptive subject lines.

Sending unsolicited emails, or spamming, is a surefire way to get blacklisted by Barracuda. To avoid this, only email people who have explicitly permitted you to contact them.

Additionally, regularly removing inactive or invalid email addresses from your list will help keep your email list clean and prevent bounced emails.

Monitor Your Email & Network Reputation

Regularly monitoring your email and network reputation can help you avoid the Barracuda blacklist.

Several tools allow you to check your email and network reputation, such as the Barracuda Reputation System and the Sender Score service, linked in this blog above.

By monitoring your reputation, you can quickly identify any issues that may be impacting your email deliverability and take action to address them before they lead to blacklisting.

Ensure Your Email Policies & Practices are Compliant

Finally, ensuring that your email policies and practices are compliant with industry standards is essential for avoiding the Barracuda blacklist.

This includes following Gmail regulations like CAN-SPAM and GDPR and adhering to best practices like using opt-in methods for collecting email addresses and providing clear opt-out instructions in every email.


Overall, the Barracuda blacklist is not a pleasant place to be hosted on. It can take time, money, and resources on your end to fix this issue.

Fortunately, if you follow the steps outlined in this blog post and discover that you are on the blacklist and need to be removed quickly, options are available for you. If you’d rather avoid the situation altogether - which I highly recommend - then make sure to use a reputable email service provider and be cautious of what addresses you email your messages to.

Last but not least, if you find yourself frequently subjecting your IP address or domain name to blacklist scrutiny, then it might be worth checking out

Unfiltered is paired with some of the best technology around in email warm up, allowing for more and better email deliverability, so why not give it a try?
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