What Is a Spam Filter?

What Is a Spam Filter?

People get many e-mails daily, some of which can be dangerous for a computer. They are often clickbait because spam e-mails’ purpose is encouraging to click and direct users to harmful websites or download detrimental folders on a computer.

Spam filters are a safety feature for many modern institutions that use emails as part of their operations, whether to transfer internal information to colleagues or communicate externally with contractors and customers. Spam filter aims to protect users from unwanted, potentially virus-infected emails.

Why Use a Spam Filter?

There are many reasons to use a spam filter. Here are the most common reasons for filtering emails for spam;


Avoiding virus-infested emails is vital for maintaining the health of your IT systems. Phishing emails are the most common form of email virus and aim to steal as much personal information from any source as possible.


When sorting through work emails, it is far easier only to have to work through ones relevant to your job. By using spam filters, all unwanted email advertising campaigns from companies you have never visited become separated, leaving your inbox more organized and accessible to sort through.

AI that learns which emails you don’t want to receive

Some spam filters expand their list based on emails the user often deletes without reading. If your email marketing emails are often unread before being deleted, you risk becoming marked as spam.

why use a spam filter

Filters Used by Spam Filters

Spam filters use many different filters to detect spam. Different types of filters;

  • Content: This filter scans the content based on the most used words in spam emails.
  • Blocklist: It stops emails from suspicious IPs.
  • Headers: It examines the header of each email to decide if it’s spam and which emails going to spam folder.
  • Language: Some spammers send emails from specific geographic areas with different languages from the native language of the receivers. This filter scans the mail to detect this issue.
  • Rule-based: It scans according to the rules applied by the user and filters specifically to these rules.
  • Bayesian: It detects the pattern in the emails the user sends as spam and automatically filters accordingly.

These filters monitor your emails and behavior with them. They learn and adapt based on which emails you add to the spam folder and which you seek out and add back to your inbox. Bayesian filters are responsible for learning your preferences and marking senders you repeatedly delete as spam. These filters are very good at spotting patterns and protecting users from any suspicious emails that are potentially full of malware or other viruses.

Spam Filter Apps

Everything You Need to Know About Web Design & SEO
Everything You Need to Know About Web Design & SEO

If you're considering starting an online business, you should make yourself conscious that you must learn about web design. Even if you are not an exp...

How to Insert a Line in Microsoft Word Documents
How to Insert a Line in Microsoft Word Documents

In Word documents, you may be introducing various terms, thoughts, or data. It is not always possible to express the needed information with words and...

There are also apps available to provide extra spam filtration. It is important to choose a trustable app to use because the app will have access to your emails and any information provided by them. These spam filter apps can also block any unwanted SMS messages or callers from numbers known to be spam.

how to work spam filter

These apps offer the same service as email spam filters on a larger scale and across multiple devices. Check the services each app provides and their ratings, and then select the app that best suits your needs. The fact that there are now multiple high-quality apps for spam filtration indicates how quickly this branch of technology continues to adapt, grow, and evolve with new products and services.

Conclusion on Spam Filters

To conclude, spam filters are a handy feature for email services. They prevent many unwanted emails from reaching their customers and can even adapt to their user’s needs. By using spam filters, companies reduce their employees’ time deleting unwanted emails while simultaneously protecting themselves from many viruses. Not only do spam filters offer protection from virus-infected emails, but they also get rid of any unsolicited marketing emails. Hopefully, you have enjoyed learning about spam filters and have taken away something valuable from this article.

Frequently Asked Questions

Spam emails typically refer to unwanted junk emails. The kind that nobody wants and are often phishing emails designed to gather victims’ personal information.

There are many free spam filters available. Most email providers have some form of spam filtering built into their service. Paid versions are available, which offer more customizable protection.

Spam filters scan suspicious emails and prevent them from reaching the end user.

With spam filtering technology continually advancing, it is increasingly difficult for legitimate emails to avoid the spam folder in potential customers’ inboxes. It can be easy to make a small mistake and have potential customers mark your email as spam. Once marked, it is virtually impossible to get out of their spam folder again. Learn how spam filters work and then avoid using the things that result in being flagged as spam, such as using symbols in the subject line of the email.

Spam filters check emails for anything that they deem suspicious. Spam filters have many things they check for, ranging from inconsistent capitalization in the subject line to excessive use of pictures in the main body of emails. These filters also check both inbound as well as outbound emails for potential spam.

Gizem Akmanlı

Posts: 82

Gizem Akmanlı, a Jr. SEO Content Editor at Dopinger, graduated from the department of Literature. She managed her blog for 5 years with her interest in content creation and editing, and then she turned to digital marketing and started to improve herself in the field of SEO. She is a supporter of s... Read More

Send Comment

Your email address will not be published. Required fields are marked *

(Total: 32 Average: 5 )

No comments to show.