--- title: "Email Filtering Security: Why It’s An Essential Feature In Enterprise Security | 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-filtering-service/email-filtering-security/" --- Content # Email Filtering Security: Why It’s An Essential Feature In Enterprise Security 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/) ## Email Filtering Security: Why It’s An Essential Feature In Enterprise Security [Spam Filtering - Sign Up](/email/spam-filtering) _Email filtering is the process of scanning and categorizing an enterprise’s inbound and outbound email traffic_. It includes segregating emails containing spam, bulk, adult content, virus, etc., thus ensuring that only the safe ones pass to the inbox of the user. The security accorded by the process to emails is what we call as **email filtering security**. While [inbound email filtering](/content/email-filtering-service/inbound-email-filtering) involves scanning of emails directed to a user’s address, **outbound email** filtering removes potentially harmful content or malware from outgoing emails. Organizations deploy outbound [email filter apps](/content/email-filtering-service/email-filter-app) to prevent leakage of confidential user/organizational data. An email security service uses [email filtering solution](/content/email-filtering-service/email-filtering-solutions) that detects and deletes hostile content at preliminary SMTP connection stage. It tags emails and quarantines inbound/outbound emails for further checking. ![enterprise spam filter](https://media.mailhop.org/duocircle/images/2019/02/business-email-compromise-what-is-it.png) ### Reasons For Using Email Filtering Services _Spammers use phishing to steal confidential data and use it for illegal purposes_. Phishing is a fraudulent attempt implemented through emails. Phishers send bulk emails to users (they may even choose C-suite employees, known as ‘Whales’) with fake URLs embedded. These links, when clicked, land the user on a web page and ask for immediate actions such as to enter personal/professional credentials. These are further used for illegal purposes or making money. These emails include: - **Malicious URLs**, if clicked, redirect to hacker’s webpage and trap the users to release their information like bank details, Social Security numbers, etc. - Attachments containing Trojans, ransomware, and other malware threats. An efficient [email filtering service](/content/email-filtering-service) uses advanced technologies to detect and categorize these spam emails so that the users do not fall prey to the malicious acts. ### Basic Operating Procedure Of Email Filter Apps In the email sending process, a mail transfer agent (MTA)/MX host/ Mail Transfer Server is software that transfers emails from one computer to another using SMTP. _Email service providers install mail filters in their respective MTAs_. These mail filters may include [anti-spam](/content/email-filtering-service/anti-spam) filters, authentication verification, anti-virus check, and URL filtering. An **email filtering solution** offers customizable [email filtering](https://en.wikipedia.org/wiki/Email%5Ffiltering) criteria to their clients. Users may set up manual filters that can fetch data according to the filter criteria set up. _Filters use machine learning for decision making by matching the regular patterns of a user_. Keyword matching is also used as a **mail filter technique**, in which a filter looks for matching keywords in the message body and sender’s email address. Procmail is a data-driven programming language (data matching rather than code sequence following), and filter software uses Procmail for complex control flow and logic. Alternatively, filters may use Document Classification Technique such as Naïve Bayes Classifier to classify the documents (attributes are: Image, Text, Music, Subject, etc.) and, based on that, make filtering decisions. ![email spam service](https://media.mailhop.org/duocircle/images/2019/02/display-name-spoofing-protection.png)![email spam filtering service](https://media.mailhop.org/duocircle/images/2019/02/phishing-protection-advanced.png) ### Some Email Filtering Tool Types: #### Bayesian Filtering This [email filtering tool](/content/email-filtering-service/email-filtering-tools) approach uses text classification and correlates the keywords or token in the email body text, subject line, the sender’s address. _It calculates the probability to detect spam emails._ #### Whitelisting This method maintains a list of trusted sender’s email addresses, and these pass without a check. #### Blacklisting Received spam emails addresses are data-based, and future emails from these addresses are blocked and filtered out to spam folder or deleted. **Email filtering security service** involves low overall management and time commitment for protecting an organization/individual from hacker’s sophisticated phishing attempts. [Enterprise spam filter reviews and ratings](/content/email-filtering-service/enterprise-spam-filter-reviews-and-ratings) rank these providers and their services to help you choose better. ##### 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. Trusted by 50,000+ organizations since 2014.","subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}],"sameAs":["https://www.linkedin.com/company/duocircle","https://x.com/duocirclellc","https://www.facebook.com/duocirclellc","https://www.g2.com/products/phish-protection-by-duocircle/reviews","https://github.com/duocircle","https://www.crunchbase.com/organization/duocircle-llc"],"contactPoint":{"@type":"ContactPoint","contactType":"customer support","url":"https://support.duocircle.com"},"knowsAbout":["Email Security","Email Authentication","SPF","DKIM","DMARC","Phishing Protection","Spam Filtering","SMTP Relay","Email Deliverability","Email Forwarding"]} ``` ```json {"@context":"https://schema.org","@type":"WebSite","name":"DuoCircle LLC","url":"https://www.duocircle.com","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. Trusted by 50,000+ organizations since 2014.","publisher":{"@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. Trusted by 50,000+ organizations since 2014.","subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]}} ``` ```json [{"@context":"https://schema.org","@type":"WebPage","name":"Email Filtering Security: Why It’s An Essential Feature In Enterprise Security","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 ","url":"https://www.duocircle.com/content/email-filtering-service/email-filtering-security/","speakable":{"@type":"SpeakableSpecification","cssSelector":[".page-answer",".duo-rich-text p:first-of-type"]},"dateModified":"2023-07-28T18:23:48.000Z","datePublished":"2019-08-19T18:54:16.000Z"},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"DuoCircle","item":"https://www.duocircle.com/"},{"@type":"ListItem","position":2,"name":"Email Filtering Security: Why It’s An Essential Feature In Enterprise Security","item":"https://www.duocircle.com/content/email-filtering-service/email-filtering-security/"}]}] ```