--- title: "Frequently Asked Questions About Spam Filtering Techniques | DuoCircle" description: "Join the thousands of organizations that use DuoCircle Find out how affordable it is for your organization today and be pleasantly surprised.Interested in" image: "https://www.duocircle.com/images/og-default.png" canonical: "https://www.duocircle.com/content/email-spam-filter/spam-filtering-techniques/" --- Content # Frequently Asked Questions About Spam Filtering Techniques Join the thousands of organizations that use DuoCircle Find out how affordable it is for your organization today and be pleasantly surprised.Interested in [ Talk to an Expert → ](/contact/) [ See what we make ](/products/) ## Frequently Asked Questions About Spam Filtering Techniques [Spam Filtering - Sign Up](/email/spam-filtering) _It becomes quite a task to continually try to get rid of spam emails that you receive regularly_. Imagine being hindered by all that spam during a busy day, which creates a pathway for internet viruses, leaving your devices and servers incompetent. Hence, [spam filtering solutions](/content/email-spam-filter/spam-filtering-solutions) have become crucial in today’s threat landscape. Here are some of the most popular FAQs surrounding **spam filtering techniques**. ![email filtering services](https://media.mailhop.org/duocircle/images/2020/11/cloud-spam-filter.png) ### What Do Spam Filters Look For? **Spam filtering** not only applies to the emails that enter your network (inbound email) but also those that leave (outbound email). There is a significant number of spam filtering solutions that you can try. _You can either host them on your computer server or incorporate them into your email software_. Choosing the [best free spam filter](/content/email-spam-filter/best-free-spam-filter) depends on the individual needs of the user. **How it works:** Fundamentally, there is a specific numerical score that is assigned to each message. This score is the probability of an email being spam. If this number exceeds the given threshold, _its entry will be prevented and marked as spam_. ### What Are The Types of Spam Filtering Techniques? All spam filtering techniques ultimately have the same objective – to **prevent the entry of spam** emails. What sets each of these filters apart is how they approach this goal. Types of Spam filtering techniques are: | List-based Filters | Content-based Filters | Other Filters | | ---------------------------- | ---------------------- | --------------------------- | | 1\. Blacklist | 1\. Word-based filters | 1.Challenge/Response System | | 2\. Whitelist | 2\. Heuristic filters | 2.Collaborative filters | | 3\. Greylist | 3\. Bayesian filters | 3.DNS Lookup Systems | | 4\. Real-time Blackhole list | | | ![email spam filter](https://media.mailhop.org/duocircle/images/2020/11/cloud-based-spam-filtering.png)![spam filtering solutions](https://media.mailhop.org/duocircle/images/2020/11/corporate-spam-filtering.png) ### My Inbox Keeps Getting Spam Emails; What To Do? Unfortunately, _there is little one can do to prevent spammers from filling your inbox with junk mail_. However, you can install **anti-spam applications** on your respective mail servers. Anti-spam techniques generally _employ one or more methods to detect spam and prevent their entry into your inbox_. The first step is to know [what a spam filter is and how it works](/content/email-spam-filter/what-is-a-spam-filter-and-how-does-it-work). After this, you can choose from a wide variety of [email spam filters](/content/email-spam-filter) and decide the best email spam filter for your inbox. For outbound spam filtering, small and medium businesses who handle a lesser volume of emails can go for a [free email spam filter](/content/email-spam-filter/free-email-spam-filter). Enterprises that need to cater to many customers can choose a dedicated service like [spam filter Gmail](/content/email-spam-filter/spam-filter-gmail). ### How To Avoid Landing In The Receiver’s Spam Folder? Another crucial aspect of outgoing emails is [how to avoid spam filters](/content/email-spam-filter/how-to-avoid-spam-filters) of the recipient. For this, one has to make sure the email design doesn’t contain specific attributes through which the recipient’s **spam service** marks it as spam. It is essential to remember that it is almost impossible to draft a message that can escape a series of filtering techniques. Hence, here’s what you can try: Use various kinds of overlapping filtering methods simultaneously. However, _ensure that the email server is not bombarded by several filtering methods at once_, or you will observe a visible effect on your server. As exasperating as email spam can be, the solution to it is relatively simple and convenient. Today’s ever-growing market is in a continuous process of developing **anti-spam technologies**. These spam filtering techniques ensure that the inbox is safeguarded against malicious content and provide the delivery of emails in the receiver’s inbox, not the spam folder! ![best free spam filter](https://media.mailhop.org/duocircle/images/2020/11/email-gateway-protection.png) ##### Join the thousands of organizations that use DuoCircle --- Find out how affordable it is for your organization today and be pleasantly surprised. [Spam Filtering - Sign Up](/email/spam-filtering)Interested in our Partner Program for MSPs and VARs? Visit Our [MSP Partner Program](/msp-partner-program). ## Ready to talk? Same-day response from someone technical. We tell you yes or no quickly. If yes, we get to work. [Talk to an Expert→](/contact/)[See what we make](/products/) ```json {"@context":"https://schema.org","@type":"Organization","name":"DuoCircle LLC","url":"https://www.duocircle.com","logo":{"@type":"ImageObject","url":"https://www.duocircle.com/images/duocircle-logo.png"},"description":"DuoCircle is a portfolio of specialized email products covering protection, authentication, delivery, and routing. We deliver about 90% of category-leader capability at roughly half the price, backed by experts who own the outcome. 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