Spammers use a variety of techniques to send spam emails, including:
- Using botnets: A botnet is a network of compromised computers that are controlled by a third party without the owners' knowledge. Spammers can use botnets to send large quantities of spam emails simultaneously, making it difficult to trace the source of the spam.
- Purchasing email lists: Spammers may purchase lists of email addresses from companies or individuals who have compiled them through various means, such as website sign-ups or contests. These lists may contain both valid and invalid email addresses, and they are often used to send out spam emails en masse.
- Hijacking legitimate email accounts: Spammers may also use malware or phishing attacks to compromise legitimate email accounts and use them to send spam emails.
- Using "open relays": An open relay is a mail server that is configured to allow anyone to send email through it, regardless of whether they are an authorized user. Spammers can use open relays to send spam emails without having to reveal their own identity or IP address.
- Creating fake email addresses: Spammers may create fake email addresses using a variety of methods, such as using random letters and numbers or misusing legitimate domain names. These fake email addresses are often used to send spam emails and to make it difficult for recipients to trace the source of the spam.
Spammers use these and other techniques to send spam emails in an attempt to promote their products, services, or ideas. However, spamming is generally illegal in many countries, and it can result in fines and other penalties for those who engage in it. To protect yourself from spam emails, it's important to be cautious when opening emails from unfamiliar senders and to use a reputable spam filter to help identify and block spam emails from reaching your inbox.