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](https://kriko.io/services/data-analysis-insight), 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 ### Dirty Data Dirty data refers to information that is inaccurate, incomplete, inconsistent, invalid, duplicated or outdated. Data is an important resource for strategic decision-making, but it… ### Cumulative Layout Shift (CLS) Cumulative Layout Shift, commonly abbreviated as CLS, is a Core Web Vitals metric that measures the visual stability of a web page. Unexpected movement… ### Nofollow Link A nofollow link is a link attribute that helps search engines evaluate the relationship between one website and another linked page. It is used… ### Key Performance Indicator A Key Performance Indicator, commonly abbreviated as KPI, is a measurable performance indicator that shows how effectively a business, department, team, project or individual… ### Cost Per Action / Cost Per Acquisition Cost Per Action or Cost Per Acquisition, commonly abbreviated as CPA, is a digital marketing metric that shows the average cost of generating a… ### Backlink A backlink, also known as an inbound link, is a link from one website to another website. When a site links to another page,… ### NoSQL NoSQL refers to database systems that operate outside the traditional relational database model and are used to store, manage and query different types of… ### Vlogger A vlogger is a person who creates regular video content based on the concept of a vlog, which means video blog. A vlog can… ### HTTPS (HyperText Transfer Protocol Secure) HTTPS stands for HyperText Transfer Protocol Secure. It is the secure version of HTTP and is used to encrypt data communication between a user… ## 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).