NoSpoofing is a free Chrome add-on developed by wchhlbt that aims to provide a user-friendly UI notification to alert users about potential email spoofing. Email UI rendering plays a significant role in determining the authenticity of an email, but many web mails and email clients do not explicitly display SPF, DKIM, or DMARC authentication results. This makes it difficult for ordinary users to fully understand email authentication details.

NoSpoofing addresses this issue by offering a simple and effective defense method. When users read an email, they can click on the extension's icon, and the web UI will indicate whether the email is safe or not. For users who want to delve deeper into the authenticity of the email, they can click on the notification message to access more detailed information.

With NoSpoofing, users can have peace of mind knowing that they are being alerted about potentially spoofed emails. This add-on serves as a valuable tool to enhance email security and protect users from falling victim to phishing attempts or other fraudulent activities.