A method and email system for improving efficiency of email discussion within an email client comprising: an email tag filter for filtering a special tag in email contents, extracting original email contents, and identifying tag related information which includes at least an author name corresponding to the email contents; and a content style setting component for receiving and keeping the tag related information fed by the email tag filter, then identifying which part of the email contents is written by which author according to the tag information, and assigning correct style to corresponding contents using a user customization style for each author. The invention differentiates different users mainly by automatically labeling the contents input by the users, and the input contents can be distributed in different positions within a single email, which matches the natural convention of the current users to use the email system.