Hyperlink.EmailSubject (PowerPoint)

Returns or sets the text string of the hyperlink subject line. The subject line is appended to the Internet address (URL) of the hyperlink.

This property is commonly used with email hyperlinks. The value of this property takes precedence over any email subject specified in the Address property of the same Hyperlink object.

ActivePresentation.Slides(1).Hyperlinks(1) _
    .EmailSubject = "Quote Request"