Forging emails to spread false information is an immoral and potentially illegal act that seriously disrupts social order and harms the rights of others, and should not be carried out. However, in order to help you understand network security risks and preventive measures, common methods used by criminals to forge emails include: 1. **Forged sender address**: Modify the sender information displayed on the email through technical means to make it look like it comes from a well-known organization, company or individual, but it is not. 2. **Tampering with email header information**: Forge the source IP address, route and other header content of the email to mislead the recipient about the true source of the email. We should resolutely resist and guard against such malicious acts, and at the same time improve our own network security awareness, not easily believe email information from unknown sources, and avoid falling into the trap of false information.