Title: Spam Author: Kriko Published: Mar 31, 2021 Last modified: Jul 11, 2026 --- 1. [Home](https://kriko.io/) / 2. [Glossary](https://kriko.io/glossary) / 3. S Letter # Spam **Spam** refers to unwanted messages sent without the recipient’s request or permission through email, SMS, social media, messaging applications or comment sections. These messages are often sent in bulk to a large number of users. Spam may include commercial advertising, campaign announcements, fake offers, fraud attempts, phishing links or attachments containing malicious software. For this reason, spam is not only an annoying type of communication but also a potential digital security risk. Email services usually move suspicious messages to the spam or junk folder. Product advertisements that the user is not interested in, campaign emails sent without permission, commercial messages from unknown organisations or messages that appear to come from a bank where the user has no account can be examples of spam. However, not every promotional email is spam. If the user has previously given permission, created an account or agreed to receive communications, such messages may fall under legitimate commercial communication. Spam messages may sometimes be sent for fraudulent purposes. Messages that imitate banks, delivery companies, public institutions or well-known brands may ask users to click a link, enter a password or download an attachment. These messages can be part of phishing attacks. Users should avoid clicking links, downloading attachments, sharing personal information or replying to suspicious messages. Several signals may be used to determine whether a message is spam. Sender reputation, IP address, domain reliability, bulk sending behaviour, message language, links, attachments and user complaints are among these signals. Email authentication mechanisms such as SPF, DKIM and DMARC also help determine whether the sender is genuinely authorised to use the domain they claim to represent. Spam detection therefore relies on both technical and behavioural data, not only on the visible message content. To protect against spam, messages from unknown senders should be reviewed carefully. Suspicious emails can be reported as spam before opening or interacting with them. Users should not click untrusted links, download attachments or share personal information. They may use unsubscribe links for unwanted commercial emails, but in messages from untrusted senders it may be safer to mark the message as spam instead of clicking any link. Spam also creates a serious reputation risk for brands. Bulk messages sent without permission, without proper targeting or to irrelevant users may seem low-cost in the short term, but they can damage brand perception in the long term. Messages marked as spam by users may reduce sender reputation and make it harder for future emails to reach the inbox. For this reason, proper targeting, clear permission, transparent communication and quality content are essential elements of healthy email marketing. ## Discover it in the dictionary ### Simple Mail Transfer Protocol (SMTP) SMTP, short for Simple Mail Transfer Protocol, is an application-layer protocol used to send emails and transfer them between mail servers. In simple terms,… ### Insight Insight is a strategic concept that plays an important role in marketing, advertising, product development and customer experience. In its simplest form, insight means… ### Google Caffeine Google Caffeine is the next-generation web indexing infrastructure that Google announced in 2009 and completed in 2010. This system was developed to help Google… ### First Input Delay (FID) First Input Delay, commonly abbreviated as FID, is a performance metric that measures the delay between the moment a user first interacts with a… ### Pareto Principle (80/20 Rule) The Pareto Principle, also known as the 80/20 rule, is an observation and prioritization approach suggesting that a large share of outcomes often comes… ### Deep Learning Deep learning is a form of machine learning that uses artificial neural networks to analyse complex data structures. Inspired by certain aspects of how… ### Remarketing Remarketing is a digital marketing method used to reach users who have previously interacted with a website or mobile application. It allows advertisers to… ### Progressive Web App (PWA) A Progressive Web App, commonly abbreviated as PWA, is a modern web application approach that allows websites to deliver an experience similar to a… ### Risk Management Risk management is the process of identifying, assessing and controlling potential events that may prevent an organisation or individual from achieving their objectives. Risk… ## Track the digital heartbeat with Kriko Subscribe to receive curated insights, news, and ideas shaping the digital landscape. By checking this box, you acknowledge and accept our [privacy policy](https://kriko.io/privacy-policy).