Every email notification has a predefined header, greeting and signature (same for all notifications) that can be edited in the Header, greeting & signature tab of the Store setup -> Email notifications page.

header.png

The greeting format is the same for both admin and customer notifications, while the format of the header and signature can be different.

customer.png
admin.png

Notification headers and signatures can be set using the following variables:

%logo%	
%company_name%
%company_link%	
%company_website%	
%company_address%	
%company_country%	
%company_state%
%company_fax%	
%company_city%	
%company_zipcode%	
%company_phone%	
%recipient_name%
%conversation_link%	
%order_number%	
%order_link%	
%order_messages_link%	
%message%

Don’t forget to save changes when done.