A method, system, and computer program product for displaying message genealogy in the language of the user interface of an email recipient using a normalized set of subject prefix codes. The method comprises: sending an email to a recipient, wherein the email has an original subject; sending a normalized code corresponding to a subject prefix for the email to the recipient; receiving and decoding at the recipient the normalized code to provide a subject prefix in a language of the user interface of the recipient; and displaying the subject prefix in the language of the user interface of the recipient adjacent the original subject of the email.