Here you can enter the phrase that you wish to appear before any quoted text in a reply that you send.
You can include one or more special placeholders to insert information about the message to which you are replying. Placeholders consist of a '%' followed by a single letter. The following placeholders are available:
%f : The sender's name and email address
%a : The sender's email address
%p : The sender's name
%r : The full RFC 2822 style date and time zone
%d : The date as www, dd mmm YYYY
%x : The date in the locale's default
%c : The date and time in the locale's default
%m : The Message-ID
%s : The subject
%n : A new line
%% : The '%' character