+@item message-subject-re-regexp
+@vindex message-subject-re-regexp
+Responses to messages have subjects that start with @samp{Re: }. This
+is @emph{not} an abbreviation of the English word ``response'', but in
+Latin, and means ``in response to''. Some illiterate nincompoops have
+failed to grasp this fact, and have ``internationalized'' their software
+to use abonimations like @samp{Aw: } (``antwort'') or @samp{Sv: }
+(``svar'') instead, which is meaningless and evil. However, you may
+have to deal with users that use these evil tools, in which case you may
+set this variable to a regexp that matches these prefixes. Myself, I
+just throw away non-compliant mail.
+