There are many technical means to forge emails to spread false information, which are often used by cyber attackers or scammers. Here are some common methods: 1. **Email Spoofing**: Attackers can modify the sender address of an email to make it look like it comes from a trusted source. This is usually achieved through simple email client or email server settings. 2. **Phishing**: Using forged emails to trick users into providing personal information or downloading malware. Phishing emails often contain links or attachments that look legitimate. 3. **Using unverified SMTP servers**: Attackers can use unsecured SMTP servers to send forged emails so that recipients cannot identify the true source of the email. 4. **Using Trojans and malware**: Attackers can use Trojans or malware to control the victim's computer and send forged emails in the name of the victim. 5. **Social Engineering**: Through social engineering, attackers can gain the trust of users and trick them into accepting forged information or including malicious links in emails. 6. Backscatter: Attackers send a large number of forged emails and use the victim's address as the sender, causing the victim to receive bounced emails. 7. Impersonation of Legitimate Websites: Attackers create fake websites that look identical to legitimate websites to trick users into clicking links in forged emails and entering their personal information. 8. SPF/DKIM/DMARC evasion: Attackers forge sender identities and bypass email security measures by suppressing or obstructing the authentication mechanisms of legitimate email servers (such as SPF, DKIM, and DMARC). 9. Exploiting public Wi-Fi or proxy servers: Attackers can use unsecured networks in public places to send forged emails, making it difficult to trace their true sources. To prevent these forged emails, you can take the following measures: - Use reliable email service providers and enable strong authentication mechanisms; - Educate users to identify phishing emails and suspicious links; - Regularly update antivirus software and email filtering systems; - Use technologies such as SPF, DKIM, and DMARC to strengthen email security. It is important that users remain vigilant and treat emails from unknown sources with caution.