24 Best Free Email Anti-Spam Filter Tools 2024 (Gmail, Outlook)

⚡️ Best Email Spam Filter

Email Spam Filtering Tools - Free Email Anti Spam Filter Softwares

Are you looking for Which Are The Best Free Email Anti-Spam Filter Tools in 2024? In this article, you will learn how to block spam emails on gmail, Best Free Email Anti-spam Softwares, cloud based email spam filter for Gmail, outlook, AOL, android & iphone. Checking email for spam is very important. Without an antispam filter, just one wrong click can put your device and your network at risk. Emails are one of the most common entry points for unsolicited, unwanted, and virus-infested emails. An Anti-spam filter stops such emails to get into inboxes. ISPs use spam filters to make sure they aren’t distributing malicious software.Considering the importance of the topic and the potential risks associated with spam, it’s crucial for individuals and businesses to invest in reliable anti-spam tools to protect their data and maintain the integrity of their communication channels.

Key Takeaways – Best Email Spam Filters

  • Importance of Anti-Spam Tools: Without an antispam filter, just one wrong click can compromise your device and network. Emails are common entry points for unsolicited, unwanted, and virus-infested emails.
  • Internet Privacy Concerns: With the rise of cybercriminals aiming to steal personal data, internet privacy has become paramount. Anti-spam programs help maintain security in electronic messaging systems.
  • Understanding SPAM: SPAM emails are unsolicited promotional mails that can sometimes be responsible for stealing your private data. Gmail, while having a robust spam filter, can sometimes miss certain spam emails.
  • Legal Implications: The CAN-SPAM Act of 2003 and Canada’s Anti-Spam Legislation (CASL) have set strict guidelines and penalties for unsolicited emails. Violations can lead to hefty fines.
  • How Spam Filters Work: Spam filters use heuristic methods, applying thousands of predefined rules to each email. They analyze content, headers, and even IP addresses to determine if an email is spam.
  • Benefits of AntiSPAM Programs: These programs offer better file protection, filtering for both incoming and outgoing messages, stable storage space, and continuity in email access even during server downtimes.
  • Risks of Ignoring Spam: Spam emails can lead to various risks including viruses, phishing attacks, compromised web links, and other malicious content. They can also overload servers and turn them into spam servers.
  • Popular Anti-Spam Tools: The article lists several tools such as Mailwasher, SolarWinds MSP Mail Assure, SpamTitan, Spameo, ZEROSPAM, Comodo Dome Antispam, MX Guarddog, SPAMfighter, ORF Fusion, Spambrella, Topsec, and Bitdefender.
  • Ransomware Threat: Ransomware is a type of malware that encrypts a user’s data and demands a ransom for its release. It can lead to business shutdowns and significant financial losses.
  • Phishing Dangers: Phishing emails mimic trusted entities to extract personal information or money. Spear phishing is a more targeted form of phishing aimed at specific individuals or organizations.

Email Spam Filtering Tools – Table for Quick Reference

Adding a table that summarizes the features of the listed anti-spam tools can greatly improve readability and help readers compare options at a glance. Here’s a suggested format for the table:

Tool Name Type Key Features Ideal for (User Type) Free Trial
Mailwasher GMAIL SPAM FILTER Checks emails before download, user-friendly Individual users Yes
SolarWinds MSP Mail Assure FREE TRIAL Cloud-based, integrates with Office 365 Business users Yes
SpamTitan Subscription-Based Machine learning, zero-day threat protection Office 365 users No
ZEROSPAM Cloud-based TLS encryption, low false-positive rate Businesses needing robust spam protection Unknown
Comodo Dome Antispam Multiple Installations Valkyrie file analysis, email filtering controls Business users Contact for info
MX Guarddog Email Spam Blocker TLS encryption, integrates with various directory services Cost-effective solutions seekers No
SPAMfighter Free & Paid Integrates with Microsoft products, user-friendly General users with basic needs Yes

Lets Dive in,

Internet privacy is one of the most important factors today because there are a lot of cybercriminals wanting to steal any personal data to perform criminal acts with them.

That is why a large number of antispam programs have been created to help you maintain greater security in your electronic messaging systems.

SPAM is the emails that you receive in your gmail inbox without any permission. They are promotional mails offering some type of product or service in order to attract the user’s attention. Where many of these sites are responsible for stealing your private data.

Gmail has a pretty good spam filter, but Gmail doesn’t always get it right. When it’s important – you can’t afford to lose any emails. Therefore, antispam programs wiill help you block all spam emails that constantly fill your inbox. Also, privacy can be improved with insured security. Gmail also allows to Customize spam filter settings in Google Workspace

⚡️ Spam Laws

The CAN-SPAM Act of 2003 became law on January 1, 2004. According to the FTC, if you violate the law, you could be fined $11,000 for each offense—that’s $11,000 for each email address on your list. ISPs around the country have already successfully sued spammers for millions of dollars under this law. If you send commercial email (generally sales or promotional content), you should familiarize yourself with the requirements of CAN-SPAM. Canada’s Anti-Spam Legislation (CASL) went into effect on July 1, 2014 and carries penalties of $1-10M per violation.

What is spam filtering?

Spam filters detect unsolicited, unwanted, and virus-infected emails (called spam) and prevent it from reaching email inboxes. Internet Service Providers (ISPs) use spam filters to ensure that they do not distribute spam. Small and medium-sized businesses (SMBs) also use spam filters to protect their employees and networks.

Spam filters apply to both incoming email (that which enters the network) and outgoing email (that which leaves the network). ISPs use both methods to protect their customers. SMBs tend to focus on inbound filters.

Concretely, anti-spam consists of the following elements:

  1. a Real-time Blackhole List or RBL ( black lists of IP addresses and emails),
  2. a heuristic analysis engine,
  3. white lists,
  4. a Bayesian method (deduction of the probability that the email is spam),
  5. spam databases,
  6. a URL verification algorithm,
  7. a DNS configuration,
  8. an SPF configuration,
  9. a transaction history,
  10. preferences of the user and the user company.

However, be careful with too strict anti-spam, because they generate false positives (legitimate emails redirected to the spam folder).

There are many spam filtering solutions available. They can be hosted in the “cloud”, on computer servers or integrated into email programs such as Microsoft Outlook.

How do spam filters work?

Spam filters use “heuristic” methods, which means that each email message is subjected to thousands of predefined rules (algorithms). Each rule assigns a numerical score to the probability that the message is spam. If the score exceeds a certain threshold, the email is marked as spam and blocked from continuing.

There are different types of spam filters for different criteria:

  • Content Filters – Analyze the content of messages, looking for words that are commonly used in spam emails.
  • Header Filters – Examine the origin of the email header for suspicious information (such as spam email addresses).
  • Block List Filters – Stops emails that come from a suspicious IP address block list. Some filters go further and check the reputation of the IP address.
  • Rule-based filters – Apply custom rules designed by your organization to exclude emails from specific senders, or emails that contain specific words in their subject line or body.

You can also run your message through certain tools, such as Mail Tester to check an email for “spam”.

Neither method is a complete solution to the spam problem, and there are always trade-offs (which heuristics try to balance) between rejecting legitimate emails and letting spam slip through.

What are the benefits of using AntiSPAM programs?

The protection of software will undoubtedly be an advantage for the user, especially today when emails have become an integral part of conducting business communication. Moreover, using this software , you can avoid having bulk junk emails.

In accordance with this, here we show you the main benefits that you will get using anti spam programs:

  • Better file protection

Most email antispam software offers users with an ability to protect all their files stored in email. This will provide them greater security . It will be a great opportunity to store all  information with secure guarantee protection at all times.

  • Apply filter on input and output messages

Being able to filter emails will help you above all to save time, especially for those small, medium and large companies where they receive most of the a lot of information through email. This will help only important messages to be filtered, leaving aside all those junk emails. Some of these applications also offer a filtering system in the outgoing messages, although this service will depend on each of the software.

  • Self-service to users

Using this service,users can create folders within the email to send all unwanted messages to quarantine. Users can delete unwanted messages to free up space in the inbox.

  • They offer a stable storage space

The main objective of these email security applications is to filter all junk and spam messages so that they do not start to consume bandwidth and take up space on the server. Taking into account that this type of message is usually possessive, that is, in just a few days you will have thousands of them hiding the information that really interests you.

  • It offers you continuity in the email

These software will give you the possibility to  continue accessing emails, send messages, check messages even when server connection fails or you are offline.

  • Goodbye to failures

When using professional Email AntiSPAM software, the client can say goodbye to failure, since the problems and inconveniences that are usually generated will disappear or almost never will be present. That is why it is important for the person to be able to get the best service  in the market since this will offer an excellent operation accompanied by maximum safety.

Why You Need an Effective Spam Filter?

Independent tester recognized that businesses typically use more functional professional email services than mainstream email services, but a similar test on popular internet security products also showed extremely low spam detection rates. 

To name just a few known examples featured in the test: Avast (96.71%), and Symantec (93.63%). With lower scores, there are Outlook and McAfee in particular.

This shows that not only do businesses need an additional anti-spam solution, but an effective solution should be chosen. Even the most powerful anti-spam mechanism mentioned above (Avast) allowed over 4000 spam emails to pass through its filters undetected in the test.

In today’s world, spam filtering is a must to protect your business. Spam is not going away.

An estimated 70 percent of all emails sent worldwide is spam, and the volume continues to grow because spam remains a lucrative business. Spammers are getting more sophisticated and creative in their tactics to push your messages into inboxes and wreak havoc. Spam filtering solutions must be continually updated to address this evolving threat.

A spam filtering solution cannot be 100% effective. However, a business email system without a spam filter is highly vulnerable, if not unusable. It is important to stop as much spam as you can, to protect your network from the many possible risks: viruses, phishing attacks, compromised web links, and other malicious content.

Spam filters also protect your servers from the overload of non-essential emails, and the worst problem of being infected with spam software that can turn them into spam servers themselves.

By preventing spam from reaching your employees’ mailboxes, spam filters offer an additional layer of protection for your users, your network, and your business.

The most important risks, however, are intrusion attempts in order to commit damage (data theft, destruction of data, theft of money, identity theft, etc.).

Pop-up Commercial Advertisements

Spurious commercial emails are emails perceived as unnecessary and sent to lists of recipients who have not explicitly given their consent (opt-in) to receive these emails.

This can happen if the listings have been bought or stolen. It is sometimes impossible to permanently unsubscribe from these lists (opt-out), which poses a real problem in terms of compliance with the GDPR.

Most of the time, these are scams or paid online services (adult sites, home loans, training, online games, premium-rate numbers, etc.).

Website Hacking via FTP – Infected with Malware

It is a precautionary measure to prevent the infection that the website has from spreading to the PCs or browsers of those who visit the web. Else, without knowing they will automatically download a virus on their computer.

Contrary to common sense (“if my site has a virus, my hosting provider’s web server is infected”), the problem is almost always on the PC from which the website is updated.

This is a very common way to add virus or malicious code to a site by tricking the user into opening spam emails. The user unintentionally opens the attachment and uploads the malicious file to their website through the FTP manager.

Spam email can damage programs, delete files, and reformat or erase your hard drive, resulting in reduced performance or even a complete crash of your system. Hackers can also use such viruses to access your personal information in order to steal or destroy your website data if you upload files from an infected PC to your website. Ref- [WordPress Hacked]

Those who are dedicated to sharing this type of virus through Spam emails, with the intention of spreading them through the internet, aim to steal fundamental information: your FTP keys.

With these keys, they upload infected files or their modified pages, without you noticing. If the attack is sufficiently elaborate, they will even instantly get your new FTP password the moment you change it.

For more info check out our indepth articles on WordPress hacking   –  WordPress Site Redirect Malware   –  How to remove malware from wordpress site   –   Hacked website showing japanese text   –   WordPress security updates   –   Ecommerce security


Phishing is an email fraud technique that involves pretending to be a trusted third party (bank, insurance, social security, etc.)program  to extract personal information or money. Phishing emails usually look like very close copies of the official website. 

A variation of phishing,  spear phishing, consists of personalizing messages sent to a small number of users (versus a generic email sent to a maximum of potential victims). 

It is estimated that 91% of hacking attacks start with a phishing email, hence the importance of   it is important to set up  effective filtering of these unwanted emails.


Ransomware is a virus that infects a workstation. It  will encrypt all or part of the files on the computer or even on the computer network.

The victim must acquire a decryption key that the hacker (pirate) gives him in return for a ransom. Ransomware can lead to a business shutdown… or worse.

In February 2016, for example, the Los Angeles hospital was hit by ransomware received by email. Medical records were inaccessible for hours endangering human lives. In 2016, ransomware revenue amounted to $ 1 billion in the United States alone (source: FBI)

How Can Email Filters Help You Block Spam?

We hope you are convinced that spam filters are essential to protecting your business. When you decide to invest or upgrade your spam filter solution, know that there are countless spam filter programs in the market. So take time to figure out which one works best for your business.

Here are some key things to watch out for:

  • At a minimum, the solution you choose should block spam. This may seem like a no-brainer, but not all spam filtering software lives up to (or doesn’t keep up with the evolution of the world of spam attacks).
  • The solution you choose should provide the security you need for your of network, but without preventing the legitimate emails that your employees need to do their jobs.
  • Administrators must have the ability to edit and create rules beyond the predefined ones for the solution to meet the needs of their organization. This customization should be easy, even for unsophisticated computer users.

⚡️List Of Best Email Anti-Spam Filter Tools & Softwares

Knowing the importance of these programs and everything they offer to their clients, here we are going to show you a list of the Most Effective Email spam filtering Services currently available in the market. This is in order that you can get the best software and thus get professional functions and tools that  to help you get an excellent service.

In accordance with this, here we show you the best antispam programs so that you can start eliminating all those unwanted emails.

Here is our list of the best anti-spam softwares free and paid:

1. Mailwasher –  GMAIL SPAM FILTER

The leader in spam filter software, and the easiest way to check and manage your e-mails before you download them to your computer.
Over 8 million people use MailWasher as their spam filter! MailWasher is free to use and won’t ever expire. It works with Outlook, Outlook Express, Incredimail, Thunderbird, Windows Live Mail, GMail, Hotmail, Yahoo, EM Client and every other email program.

2. SolarWinds MSP Mail Assure (FREE TRIAL)


SolarWinds MSP Mail Assure is intelligent mail protection and filtering engine used to block spam, viruses, and malware from violating your email. The program receives information from more than 1.8 million domains to provide the user with a better understanding of current threats. By using the software, the user can see problematic messages quarantined and blacklisted from senders suspected of contacting them.

SolarWinds Mail Assure is a cloud-based solution that makes setup and deployment easy. To start monitoring you just need to add a new domain. Once installed, it benefits from SSL / TLS Traffic Encryption.

The tool is ideal for business users because it offers integration for  withOffice 365. If the Office 365 email service stops working, the user can send emails from the SolarWinds Mail Assure web-based dashboard instead. In the event of an outage, the control panel allows you to keep your service running.

In general, if you are looking for an antispam solution that protects your email from attackers, then SolarWinds Mail Assure is a good choice. To view the pricing for SolarWinds Mail Assure, you will need to contact the sales team directly. There is also a 30-day free trial.

3. SpamTitan


SpamTitan has based antispam solution on the web intended for Microsoft Office 365 accounts The tool is designed to detect phishing attacks, and zero-day attacks. To recognize the latest threats. SpamTitan uses a mixture of machine learning and Bayesian analysis to identify new attacks. Zero-day threat protection is great for minimizing exposure to emerging threats.

IP address whitelist and blacklist controls whether mail reaches your inbox or is blocked from future communication. For more extensive security, you can apply different degrees of Spam Trust Levels to users, Usergroups, and domains. By segmenting your email environment in this way, you can manage potential entry points much more effectively.

If you are using Office 365 then SpamTitan might be right for your organization. The price of SpamTitan depends on the number of mailboxes you want   required to protect and the number of users. Pricing starts at $ 37.50 for one user and one mailbox billed monthly.

4. Spameo – Spam filter gmail


Antispam Chrome Extension helps you remove and filter all spam emails from your Gmail mailbox. It is an easy way to block senders and filter emails in Gmail. THe users can filter and block emails and senders. 

The cloud-based extension has a one-time fee of $ 37.00 per user and offers documents to help you familiarize yourself with its use. Gmail users receive too many emails.

5. ZEROSPAM – Antispam Solution


Zero spam is a cloud-based antispam solution that protects against spam, data hijacking,  and email phishing. If someone sends you an email with a bad link or malicious attachment, Zero spam will block it. For added protection, the program uses TLS encryption to keep your interactions safe from spies. In case the client-server crashes, the tool will use the automatic mail queue to help you get back to normal operations as soon as possible.

The low false-positive rate of Zero spam is one of the main reasons for using the product. It strikes a balance between dismissing harmful messages without blocking communications from legitimate users. From a business perspective, this is an anti-spam platform that doesn’t hamper day-to-day operations.

The solution is also crash-resistant. Zero spam is powered by a network of more than 20 filtering nodes hosted on three Canadian data to make sure the service stays online. This means that even if something goes wrong, your service remains available when you need it.

6. Comodo Dome Antispam


Comodo Dome Antispam is a spam prevention tool designed for business users. Comodo Dome Antispam scans and filters emails to keep inbox safe from cyber attackers. When downloading files from inbox, Comodo Dome Antispam uses its Valkyrie file verdict platform to analyze files as they are downloaded. 

You can open and interact with a file without risk of infection, even from the latest malware attacks.

Email filtering controls the type of messages you see while opening your email account. Emails with viruses are blocked, so you are not logged out to ensure you have full transparency about the emails sent to your inbox. Through the management console, you can view archived and quarantined emails.

There are three installations of Comodo Dome Antispam available: Shared Server, Hosted Cloud, and On-site. To see the prices, you must contact the company directly. If you are looking for an antispam solution with flexible deployment options, Comodo Dome Antispam is highly recommended.

7. MX Guarddog – Email Spam Blocker


MX Guarddog is a spam blocker that uses TLS encryption to protect your email inbox. Phishing attacks, malware, DDOS attacks, and viruses are just a few to name that MX Guarddog defends against. Once communication is blocked, you can view a quarantine report that will show the blocked  message information.

Legitimate mail is forwarded directly to your email server. MX Guarddog automatically synchronizes email addresses from Windows AD, LDAP, and cPanel systems for convenience. In the event your server goes down, your mail will be stored and delivered to you automatically the next time you are online.

MX Guarddog is an excellent low-cost alternative to stop spam in its tracks. The tool works like a SaaS package and starts at a price of $ 0.25 per email address, per month. There is no charge for user or domain aliases.

8. SPAMfighter


This is another of the filters available which will help avoid the presence of spam in your inbox. It stands out for being a complete and very easy-to-use filter that can be added to Outlook and Outlook Express mail. Therefore, SPAMfighter is characterized by eliminating the presence of any unwanted messages and malware.

To make use of it, the client can download it completely for free and only configure it on their server. It stands out for being very easy to use and for offering a large number of options that will help you achieve the most optimal results. 

SPAMfighter has also become Microsoft’s main ally, who together have created this antispam tool, is one of the most solid and complete currently. It can also be used in Windows Mail, Windows Live Mail or Thunderbird.

9. ORF Fusion – Email spam filtering solution


ORF Fusion is a piece of spam filter software designed specifically for business use cases. The tool removes false positives and ensures that legitimate email reaches your inbox. One of the unique selling points of ORF Fusion is that it has 23 layered tests to check mail status. These tests are a mixture of blacklist and whitelist tests that stop malicious emails without affecting genuine emails.

You can create a whitelist to make sure your trusted senders don’t get through the spam filter. The user also has control over what happens to those emails that are caught by the spam filter. For example, you can bounce them to reject the transmission, keep the mail, or redirect it to a different mailbox.

Overall, ORF Fusion’s low false-positive rate makes it ideal for companies seeking security that does not impede their ability to communicate. ORF Fusion integrates with Microsoft Exchange and the IIS SMTP Service. Product pricing starts at $ 55 per year for 10 users.

10. Spambrella


Spambrella protects thousands of end-users and handles tens of millions of messages per day. Spambrella has a highly diversified customer base on a global scale. Spambrella targets large and midsize organizations in all major vertical sectors, including financial services, retail, manufacturing, aerospace and defense, healthcare, education, and government. Spambrella is also used by well-known non-profit organizations, retail businesses, banks, and aerospace and defense contractors.

Spambrella attracts clients and partners of all sizes. Spambrella targets managed service providers (resellers) and end-users who require secure email communications. 

11. Topsec


Topsec Email Security removes spam, viruses, and malware and quarantines unwanted or illegal content according to customer requirements. Topsec Email Security works at the internet level  works online and effectively ensures in real-time that all incoming emails are scanned for spam and other threats before they are released onto your network. Topsec Email Security quarantines email according to your company’s email policy.

Topsec Email Security is fully scalable and is suitable for SMEs, large companies, and government agencies.

12. Bitdefender


Bitdefender is currently one of the most important and popular programs to maintain the security of your technological device, whether for a computer or smartphone. This is how this software provides excellent quality antimalware and antispam that will help you protect your information stored in your email. In addition, it will guarantee you excellent security in each of your  receiving messages.

For this, Bitdefender offers multilayer security against any type of cyber-attack or antispam, also offering real-time protection. Therefore, Bitdefender has become one of the best options to be able to control and eliminate spam from your Gmail or Outlook account.

Some of the most important features of this software are the following: It offers a secure environment for messages avoiding both external and internal threats, it has an on-demand anti-malware scan, it offers protection to physical and virtual mail servers and it has a centralized administration.

13. BullGuard.com


BullGuard is considered today as one of the best antiviruses with the antispam function included in its system, which makes it one of the best alternatives when you want to maintain protection within your email inbox. 

One of the big problems that spam messages cause is that they quickly fill up your inbox with junk emails and end up taking up space in your storage memory.

Due to these problems generated by these unwanted messages, BullGuard is in charge of offering the necessary tools to be able to control all this. To do this, it checks each of the messages received to see if it is a phishing or spam attempt and thus eliminates it. 

One of its main advantages is that it offers constant updates that are carried out automatically, which allows you to enjoy updated options to block any type of spam.

In the same way, it stands out for offering a very complete security system where it is capable of controlling almost all existing threats on the network. You can start using this program for free, although it also has a paid version that works through different plans.

14. MailChannels


MailChannels offers solutions that protect businesses from malicious email threats. MailChannels Cloud is a secure SMTP relay service that scans outgoing email traffic to block spamming, avoid IP blacklists, and detect compromised accounts.

MailChannels is an email delivery service built for hosts. The outbound spam filter makes it easy to deliver secure and reliable emails to your customers.

15. Avast


Avast is another of the most recognized and popular programs around the world, this is because it offers very good tools that will help you achieve the best results in terms of digital security. This is how it not only offers you antivirus tools but also has very interesting antispam features, thus allowing you to have better control over your inbox.

Deleting spam has never been easier than Avast Internet Security. To make use of this function and permanently eliminate spam from your email, you will have to download this option from its own platform.

In order to download this option in Avast, you will have to go to the “Settings” section and there you select the “Components” option and then look for the AntiSPAM option to install it on your computer. This will help you to have better control over your messages and thus avoid wasting time on those that do not interest you.

16. Xeams


Xeams is a powerful and secure mail server for Windows, Linux, Solaris, MacOSX, and other versions of UNIX. It also supports SMTP, POP3, and IMAP. Xeams includes a powerful spam filtering engine that removes up to 99% of junk email right out of the box. This software offers a flexible approach to email and a host of other features, making it a very user-friendly server. Mass email manager.

Small, medium, and large companies and ISPs.

17 Symantec.com


Spam can become quite tedious when your email address is used mainly for work purposes. Since this spam simply takes time and overloads the system, causing your company’s reputation to go down. That is why Symantec  has created very advanced tools capable of eliminating these types of messages.

In order To prevent spam, it is necessary for the system to be protected against multiprotocol message traffic malware. This is what will allow you to filter all the content and thus eliminate all the spams that appear along the way. It also offers protection against leaks of IP, data and any other private information that may be at risk.

Symantec is known today as an antivirus, but it has an antispam system that will help you protect all your incoming and outgoing messages from both internal and external threats. Its main function is to detect unwanted messages and block them before they reach the server, which will allow you to have a spam-free inbox.

 18. MicroFocus.com


It is specialized in providing protection to  messages, thus providing security and protection 24 hours a day, for this, it has an antivirus, antimalware and antispam service that is responsible for detecting any abnormality to avoid the presence of some of them within the server. 

Regarding its antispam function, it has the protection of unwanted emails, preventing this type of traffic from being present in your tray.

In the same way, Gwava has different functions such as detecting spam before it reaches the email server. Thus blocking these addresses, offering content filtering, a reputation scan, performs advanced filtering of the email address. It also includes mail,  subject, header, footprints, body, and attachments, in order to detect the origin of the message.

All these and many other functions will allow Gwava to have very advanced control over what is the protection of your email, avoiding that it is constantly attacked with these unwanted emails that in the long run end up becoming a real problem for the user.

19. K9 Anti Spam

K9 is another software that will help you avoid the presence of annoying unwanted messages in your email inbox. Taking into account that these types of emails are usually very insistent and tedious, occupying a large part of the storage space offered by your server. 

This is how K9 offers excellent spam filtering applications that will help you eliminate their presence.

It is currently considered one of the most powerful and efficient programs on in the market. In addition to blocking all those spam emails, if it detects the presence of a message that could end up being dangerous, it will send it directly to the spam folder so that you can decide what to do with it.

K9 works with the POP3 program and is compatible with the servers of Outlook, Yahoo, Gmail, AOL, among others. This is completely free software to help you have better control of your inbox.

20. GFI.com


This is another antispam currently available on the market and with which you can start to control everything you receive in your email. This software is designed to offer maximum antispam security by blocking any type of unwanted message that is sent to your server. It is available for almost all existing email servers on the market today.

Not only does it stand out for offering protection against spam, but it also offers security against malware, which makes it possible to avoid any type of attack on the email infrastructure. 

For all this,  GFI Mail Essentials makes use of different advanced elements that will help you achieve the best results.

For this, it has a powerful and very effective spam filtering, it has five antivirus engines, 

  • it blocks all spyware and phishing so that they do not reach your inbox, 
  • it offers protection against malware and spam, it has a POP3 downloader, 
  • it has a scanner service to detect malicious emails and can be installed on different servers.

21. Spamihilator


Spamihilator is another of the alternatives available today in the digital market and with which you will be able to control all the scams that affect your email address on a daily basis. This program is a filter that acts as an intermediary between what is the client and the server where it performs an examination of each of the messages that are downloaded.

In this case, it evaluates the state of each one of them and will only let pass those that act under certain rules and that does not pose any type of danger to the client. All this procedure runs in the background where only the user must add their email address data, such as the user and the type of server they use.

One of the main advantages of Spamihilator is that it is compatible with almost all email clients such as Outlook, Yahoo, Gmail, among many others. 

In addition, this is a completely free program which makes it a very good option to start trying it without losing anything in return.

22. Mailwasher Free


Mailwasher has become a very complete and advanced tool when it comes to controlling spam in emails. This is how it allows you to delete all those messages that you do not want without the need to download them.

In addition, it stands out for offering a very well-developed interface that is very easy to use. All this has led it to become one of the best alternatives to try to control unwanted spam in your email inbox. You can download it at no cost.

23. CleanMail

CleanMail is an antivirus and spam filter that works with Thunderbird and other email clients. The programs can protect you not only from spam but also from malware and phishing attacks. It uses the SpamAssassin classifier combined with the Bayes database to determine spam from other emails.

Other notable features of CleanMail are the antivirus filter, the attachment filter, the DNS blacklist, the shared fingerprint filter, and the lag filter. 

The Cleanmail plan starts at $ 279 for 10 email addresses, but you can try the tool using a 30-day free trial. Get a free trial of CleanMail.

24. POPFile


POPFile is an automatic email classification program that filters spam to filter spam that reaches your email address. POPFile uses categories for classification, but also allows users to create their own categories, such as work and personal category, for better email management.

The software uses the Bayes algorithm and requires users to train the tool by classifying spam and non-spam messages manually before it can begin to classify spam automatically. You can download the latest version of POPFile from the official website, which was last updated in September 2015.

You can read about more spam filters in our detailed article on the best Windows spam filter, most of which are also compatible with Thunderbird and Windows email clients.


There is so much variety among antispam software providers that it can be difficult to choose. If you’re not sure, you can’t go wrong with a tool like SolarWinds Mail Assure or SpamTitan. 

In this age where email scrapping tools help promoters bombard anyone with their sales pitch via spamming, it is important to have one of these best antispam filters for protecting your interest.

These tools are easy to use with whitelists and blacklists to control what email reaches your inbox. You can also check others from this the list given above, they all can do miracles for you.

Best email spam filters


Additional FAQS

  1. What is an email spam filter?
    • An email spam filter is a program that identifies unsolicited, unwanted, and malicious emails, preventing them from reaching your inbox. It uses various methods like heuristic analysis, IP address blacklists, and content filtering to detect spam.
  2. Why are anti-spam tools important?
    • Anti-spam tools are crucial for protecting your device and network from malware, phishing attacks, and other malicious threats that often come through emails. They also help in managing email storage by blocking unwanted emails.
  3. How do I choose the right anti-spam tool?
    • Consider factors like compatibility with your email system, the balance between false positives and missed spam, ease of use, customer support, and specific features like outbound filtering or integration with business email platforms.
  4. What legal considerations should I keep in mind regarding spam?
    • Familiarize yourself with laws like the CAN-SPAM Act of 2003 in the U.S. and Canada’s Anti-Spam Legislation (CASL), which impose fines for sending spam emails and require explicit consent from recipients.
  5. Can spam filters block all spam emails?
    • No spam filter can block all spam emails due to the continually evolving nature of spam tactics. However, a good spam filter can significantly reduce the amount of spam you receive and provide substantial protection against threats.
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