Our system sends emails out in our client's default language but all emails are translated in to many other languages. What can we include on the email that would let a user know the email is available in other languages.
Currently we use flags to represent languages but flags != languages. By clicking on the flag the user is taken to a translated version of the email. At one point we used a footer with the language names listed across the bottom but that caused our messages to get marked as spam more often.
Update: This email is sent to new users so we have no knowledge of their language preferences.