Last updated on July, 30

🏆 Best Spam Blockers for August 2021

Avoid unnecessary emails from unwanted senders with the use of a spam blocker. This software is designed to block threats, protect your identity, and secure your activities online.

What is a spam blocker 

Are you getting unwanted messages? A spam blocker is a kind of software designed to block unsolicited bulk emails or spam from your inbox. Spam blockers, also known as spam filters, have lists that contain addresses that are either allowed to pass through or blocked. Now you can avoid potentially harmful messages and only interact with legitimate emails.

Why do you need a spam blocker 

While technology has made it easier for everyone to communicate, it has also been a means for targeted attacks and scams. On average, nearly 45% of emails are spam. Spam blockers can be a reliable tool to filter out unwanted risks. It can ensure that only legitimate messages can get through to your inbox. Here are some of the benefits of using a spam blocker.

Filter Legitimate Messages

Going through all your messages and picking out which ones are spam and which ones aren’t can be an exhausting and time-consuming process. Real emails or calls from your contacts need to stand out and avoid being trashed. Having a spam blocker app can do all this work for you, so you don’t miss important emails and messages.

Block Threats

Spam messages may contain links to malware or viruses. Just one wrong click can disable your network and cause harm to your system. Phishing scams where fraudsters try to get your information are also common. You can remove these kinds of messages from going into your inbox by using effective email spam blockers.

Meet Data Regulations

If you are working in a large organization, you know the value of ensuring that your data remains safe and intact. Businesses receive many emails every day, but you still need to adhere to strict privacy and data storage regulations. Using spam blocker software can help you comply with those conditions and reduce the risk of data breaches.

Save Time

Looking through all the messages, you receive and analyzing their content is time-consuming and requires a lot of effort. Instead of manually going through each email, you can focus your energy on more productive things instead. A spam blocker can be implemented quickly and utilized advanced technology to make filtering decisions for you.

Protect Your Reputation

Companies that have experienced data breaches can face large financial losses when they fail to protect client data. This can also affect your business reputation in the long run, making it difficult for other customers to trust you with their information. Anti-spam blockers can help ensure that these situations don’t happen so that you can maintain your business’s image.

Audit and Archive Emails

Many spam blockers offer the service of keeping spam emails saved for a specific time. Auditors can use spam blockers to identify potential abnormalities in the misuse of emails. By recovering these messages, you can determine if there is misappropriated information. You can retrieve potentially important messages and keep them from being deleted with junk mails. 

Increase Security

Scammers have developed techniques to make their messages look like they came from legitimate senders. The less interaction you have with emails containing phishing links or malware content, the less likely hackers will get ahold of your information. Spam blockers can provide an extra layer of security so your data will not be compromised.

Core features of spam blockers 

Spam blockers are tools that anyone can use to cope with unwanted emails. It inspects your messages and prevents useless messages from reaching your inbox. The best spam blockers are those that are easy to implement and manage. When selecting a spam blocker, whether it’s for business or personal use, here are some features to consider.

Inbound and Outbound Mail Scanning

Spam blockers should block infected attachments, messages with specific keywords, and anything that looks like spam. The security features allow you to identify compromised email accounts and block them, so you don’t receive messages from that address again. You can mitigate threats and avoid malware and phishing attacks.

Compatibility with Multiple Platforms

A spam blocker that’s limited to a single platform is too restrictive. Since you may deal with senders and recipients who use different messaging solutions, you’ll need the best spam blocker apps that work with your communication service. You don’t have to limit yourself to using a single platform only, but you can still communicate through different channels securely.

Malicious URL Blocking

Malicious URL blocking prevents the delivery of messages that contain links to unsafe websites. This feature helps in phishing protection and stops you from divulging login credentials and important information. Identify websites that are hiding their true identity behind proxy servers immediately to avoid them. This precaution can prevent data theft and security breaches.

Logging and Reporting

Get the data you need regarding your inbound and outbound messages. In case of data breaches, this can help you trace what went wrong. It also allows you to identify false positives or those messages that have been marked as spam but actually aren’t. The information you gain from these reports can help you gain insights into your account’s interactions.


Greylisting identifies spam from previously unknown sources and temporarily rejects them. This feature will send a request to the originating server. A legitimate source will respond to the request within a matter of minutes, while a spam server will be too busy to respond. Greylisting makes it easier to know which addresses so accept or deny, so you only receive real messages.

Multi-layer Security

Having your messages go through specific criteria to pass before you can receive them will help segregate spam email and malware. Spam blockers will check the content of your messages, especially those that are sent in bulk. The database of the senders and IP addresses will also be inspected and analyzed so that legitimate sources can be saved for future reference.

Easy to Install Application

Whether you are using a phone spam blocker or a spam blocker for your email, the software should be easy to install. It would be best if it didn’t require you to download other agent software and that no additional configuration is needed. This way, you can just let it run in the background while focusing on more critical tasks.

Multilingual Capabilities

Messages can come in the form of many languages. Even if your account only interacts with local accounts, it’s still possible for you to receive spam messages from international senders who use different languages. Spam blocker solutions that offer multilingual support can identify spam, even if it’s in another language, and block it immediately. 

Affordable Pricing

Free spam blockers can block out the most common types of spam messages that are usually sent out. However, you can choose to upgrade for a more in-depth inspection and analysis of your emails or calls. Many spam blockers have inexpensive pricing packages so you or your business can stay protected even at a small cost.

Types of spam blockers 

Spam remains a constant nuisance that could potentially unleash nasty viruses or steal your information. Using the right tool to filter out your messages can reduce the number of unsolicited messages or calls you have to deal with. There are many kinds of spam blockers based on the types of spam you want to avoid.

List-Based Spam Blockers

Blacklists, whitelists, and greylists stop spam by categorizing senders as either spammers or trusted users. The messages from these senders are then blocked or allowed accordingly. With whitelists, you can enumerate the accounts you usually interact with, and the software will filter out the other IP or addresses that aren’t on your spam blocker list.

For whitelists, all you need to do is add your trusted addresses to a list. Messages from those senders will be sent to your inbox. Blacklists automatically check the reputation of the IP or address of the sender so that it can be blocked in the future. It saves you time, and you can easily set up and modify these lists.

Some spam blockers lists have an automatic whitelist system, which checks against a database if the sender has any known history of spamming. If they don’t, they automatically get marked as a trusted sender so that you can receive messages from them immediately. It adds a layer of protection, so you only deal with legitimate users.

Blacklists don’t always ensure that spammers cannot reach your inbox. They can misidentify legitimate senders as spammers, and you may miss important messages. These false positives can be a hassle since you’ll have to retrieve your mail manually. Some users also frequently change their IP addresses so that blacklists may miss them.

A greylist spam blocker initially rejects messages from unknown addresses and sends a failure message to the originating server. Legitimate senders always respond quickly to these messages, adding them to a list of trusted users. However, this process may be time-consuming and inconvenient if you are expecting time-sensitive messages.

Content-Based Spam Blockers

Rather than categorizing messages based on the sender, content-based spam blockers evaluate the words and phrases in individual messages. Some applications even use artificial intelligence and machine learning to easily define whether the message will be marked as spam or not. You can also determine the rules of the filter depending on your specific needs.

Prevent messages that contain the most common spam words from finding their way into your inbox. Heuristic filters will take into consideration multiple terms that are considered suspicious. It calculates the probability of that message being spam and automatically blocks it if it reaches specific criteria.

Bayesian filters are an advanced form of spam blocker that advanced algorithms for your inbox’s security. It observes the messages you mark as spam and learns to block emails with a similar pattern. You can “train” the blocker so that it can quickly distinguish harmful content from allowable messages.

If the filter has been set up to block the word “discount,” you may miss out on offers from real senders. Some spammers and fraudsters are also aware of how these spam blockers work and use them to their advantage. They may purposely misspell keywords to evade word-based filters so they can still get into your inbox.

For Bayesian spam blockers, you have to train it manually before it starts to work well. This may be burdensome and takes a long time. You’ll need a lot of patience, and you may have to delete junk mail manually at first. While doing this, there’s also a chance that you encounter dangerous messages that your blocker has not detected.

Cell Phone Spam Blockers

Spam messages are not just found in emails. Many users also receive fraudulent SMS texts. Robocalls, where computerized auto-dialers deliver telemarketing scams, are also common. Some phone or landline spam blockers are designed to work to identify each incoming text or call and analyze if it’s legitimate or not.  

Many people receive robocalls every day. Scammers use advanced auto dialing technology, so you think you’re talking to real people. You may be misled into giving out important information or falling for fraud deals. The best phone spam blockers can detect the most common phone numbers that send out fake messages or make spam calls. 

Spam calls are on the rise, with telemarketers taking advantage of the technology available. Even by simply answering these calls, you may be put at risk because fraudsters will know that they dialed a legitimate number. Phone and SMS spam blockers can make sure that you never receive those messages or calls in the first place.

If you set out too many filters for your spam blocker application, you may end up missing calls and messages from trusted users. Instead of helping you out, the spam blocker application may misidentify numbers and accidentally mark them as spam. Those missed calls or messages may also be hard to detect, especially if you’re not notified.

Collaborative Spam Blockers

A collaborative spam blocker delivers notices to all the community users about all the spam reported by members of the network. It’s an approach that utilizes the input from users around the globe. Any emails marked as spam are reported to a central database so that other users can also mark similar messages as junk. 

This type of spam blocker uses a large, active user base. You can quickly stop a spam outbreak in a matter of minutes. This works exceptionally well for bulk spam emails that many people have received. With users working together to prevent malicious content from spreading, you can quickly stop such messages from entering your inbox. 

Spammers are always coming up with new ways to penetrate your filtering system and get into your network. However, with a community-based approach, you and other users can collaborate to fight such scams. You can quickly detect not-previously-seen spam content and stop it from reaching other users.

One potential downside to this collaborative spam blocking method is that a group of spammers may mobilize in large numbers. They can pretend to be legitimate users of the system and largely skew results. If this happens, they can easily mislabel spam messages as trustworthy messages.

Who needs spam blockers?

Business Employees

Businesses deal with a large number of emails and phone calls daily. Spam can drain productivity and waste a considerable amount of time. Without effective spam blocking, employees could receive a high amount of malicious messages resulting in costly data breaches. You can prevent all this simply by investing in a spam blocker solution.

IT Professionals

The IT team of any organization should be the first to implement security measures for emails and calls. By enabling strong spam blockers, you can prevent phishing emails from reaching end-users. These precautions can go a long way in stopping even more significant problems to arise like viruses, ransomware, or malware. 

Human Resource Managers

Human resource managers send and receive a lot of emails in a day. Dealing with applicants and handling their data can be a challenging process. Spam blockers can cut down the messages you have to open by filtering out any unwanted content. You can also include spam blockers as part of new employee orientation so everyone can utilize them for security.


Many businesses use email marketing as a part of their advertising strategy. However, spam blockers may prevent your messages from reaching end-users. You can install these spam blockers so you can figure out how it works. Use it to your advantage so that your legitimate marketing offers don’t end up in the junk folder of your customers.

Ordinary Home Users

If you’re one of those people who mainly just use your phone or email for communication purposes, then a spam blocker is still of great use. Protect your data from being stolen and your account from being hacked. You can avoid unwanted promotions or messages containing malware from reaching your device with spam blockers.

Step-by-step guide in using a spam blocker

Step1: Install a spam blocker. 

Spam blockers can come in the form of phone applications, browser extensions, or downloadable software. You can look for the best free spam blockers to prevent the most common junk mail or calls from entering your system. If you need more robust filtering, you can also avail of paid cell phone spam blocker apps or software for your desktop. 

Step 2: Set up your filters. 

Establish parameters and add trusted addresses to your contact lists. You can also block certain contacts, so you never receive messages or calls from them. If you are using bayesian filters, you can input certain words or phrases you don’t want to receive. You can always modify these settings to change your preferences at any time.

Step 3: Activate the spam blocker. 

After setting up your filters, go ahead and activate your spam blocker. The software will run in the background when you receive a message or call. You can even categorize your contacts so you’ll see the most urgent and important messages first. If you receive unwanted messages, you can tag the sender as spam so you won’t receive messages from them again.

Step 4: Retrieve messages when needed. 

There are times when the activities of your spam blockers will result in false positives. It means that legitimate messages were marked as spam even though they aren’t. You don’t have to worry because the spam blocker retains these messages for a certain amount of time, so you can access them when needed. You can just go to the Spam folder and retrieve your message.

Step 5: Report scams or phishing messages.

If you encounter phishing scammers pretending to be someone else, you can report them to the appropriate organization, so they know that someone is trying to use their name for illegal purposes. Make sure to block those senders, so you don’t receive similar messages again. You may also call your service provider so they can block those kinds of emails or calls. 

Frequently Asked Questions (FAQs)

It’s challenging to determine exactly how people who send unsolicited messages collect email addresses. Some may use search engines, chat rooms, unsecured email lists to obtain information. Other companies even use web crawlers to harvest email addresses. Unfortunately, if your email is available on a public web page, it’s quite easy to get it.

There are also times when spammers will use tools to generate the most common email addresses. You can use a free spam blocker for the email to lessen the likelihood of receiving this type of content. For smarter and deeper message segregation, you may also avail of upgraded spam blocker applications or software.

Unfortunately, spammers will often disguise their sender information and fake their IP addresses. These techniques make it difficult to determine who the spam came from. You can try tracing the internet path, or you can try and contact your service provider for assistance.

No. Doing this confirms to spammers that your email address is real, and they may even add you to their database. You may end up receiving more spam, or your information may even be sold to other users. The best solution is to delete such messages without opening them and use paid or free email spam blockers for protection.

Legitimate commercial email lists will often have an unsubscribe button that includes instructions on how you can stop receiving emails from them. You may do this if you know that you are unsubscribing from a trusted sender. However, you must take extra precaution when opting into such email lists.

The most common type of spam message is offering products or services. Phishing emails are also quite common. This type of message is usually sent by people pretending to be a bank or other legitimate organization, giving you the warning to change your password. They provide links that lead to malicious sites to get your data.

Nigerian letters are also another type of spam mail that may sound strange but are quite common. Business people try to make you believe that they have inherited a lot of money, but they need financial help to get out of the Western world. Many people read these messages and send them money but never see a penny of it in return.

Spam is cheap marketing that can reach millions of people at a low cost. Unfortunately, these messages do work on some people, so they end up receiving more spam messages. A free spam blocker app is a simple solution for you to avoid this. You can even invest in premium spam blockers for advanced message filtering.

This is a well-known myth. Spammers will try to find ways to get your information one way or another. Even with a simple newsletter subscription or newsgroup post, your address or number can be shared and sold all over the web. Fortunately, you can make use of paid or free spam blockers to lessen unwanted messages or calls.

While it is not recommended, yes, you can turn spam blockers off. You can usually find this option in your service’s settings. You will receive all messages and calls from any sender or caller. Do note that doing this can lead you to receive potentially dangerous messages or emails. 

Spam is the equivalent of digital junk mail, and spam blockers automatically filter out these messages. Phishing emails usually contain links or attachments that can possibly infect your system with malware to steal your information. Spam blockers will try to spot these scams and prevent them from going into your inbox.

On the other hand, antivirus protects you from malware that’s designed to corrupt or access information stored in your device. This software is hidden in email attachments or websites. An antivirus will prevent you from visiting those sites or downloading such suspicious files. 

A robocall is a phone call that uses computerized autodialers to deliver pre-recorded messages to you. Their purpose is to pass information to a significant number of people quickly. These calls are usually associated with political or telemarketing campaigns. The true source of these robocalls is usually hidden or falsified, so you can’t trace them.

There’s no danger in getting the call. However, it still poses potential risks because these robocalls will know that your number is “good” once you answer them. You may receive more calls next time. The less you answer, the fewer the calls. You may also use phone spam blockers to avoid receiving them from contacting you in the first place.

Many spam blockers retain spam messages for a certain period before deleting them for good. The duration of these messages staying in that folder depends on your service provider. However, 30 days is quite a common fixed period for many spam blockers to keep your spam emails before permanently deleting them.

Often, yes. All messages and attachments take up space, even junk messages. The good news is, you can usually delete these messages to free up extra storage. Your service provider will have settings that allow you to set the number of days before these messages are deleted. You can also manually remove them yourself.

An email is considered to be spoofed when spammers forge the email addresses of legitimate organizations or persons. Recipients are tricked into thinking that the message came from a trusted source. Email spoofing is usually done to facilitate phishing activities. 

Spam blockers check messages against thousands of rules and parameters to determine if the message is spam. However, it may not always be correct. Spammers will try to find ways to get through these filters. You can solve this simply by marking the message as spam, so you don’t receive messages from that sender again.