The issue allows remote attackers to inject arbitrary web script or HTML via various components of an e-mail message, including the subject, body, and Date header. This can be achieved through different methods, such as using a JavaScript alert function with the fromCharCode method, incorporating a SCRIPT element, or utilizing a crafted SRC attribute of an IFRAME element. Additionally, attackers can exploit this by using a data: URL in the CONTENT attribute of an HTTP-EQUIV="refresh" META element or by leveraging a Cascading Style Sheets (CSS) expression property in the STYLE attribute of an element, such as an IMG element.