diff -Nuar sudo-1.7.0/logging.c sudo-1.7.0-charset/logging.c
--- sudo-1.7.0/logging.c	2008-11-09 16:13:12.000000000 +0200
+++ sudo-1.7.0-charset/logging.c	2009-12-02 14:12:28.745079291 +0200
@@ -54,6 +54,7 @@
 #include <time.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <langinfo.h>
 
 #include "sudo.h"
 
@@ -571,8 +572,8 @@
     mail = fdopen(pfd[1], "w");
 
     /* Pipes are all setup, send message. */
-    (void) fprintf(mail, "To: %s\nFrom: %s\nAuto-Submitted: %s\nSubject: ",
-	def_mailto, def_mailfrom ? def_mailfrom : user_name, "auto-generated");
+    (void) fprintf(mail, "To: %s\nFrom: %s\nAuto-Submitted: %s\nContent-Type: text/plain; charset=\"%s\"\nContent-Transfer-Encoding: 8bit\nSubject: ",
+	def_mailto, def_mailfrom ? def_mailfrom : user_name, "auto-generated", nl_langinfo(CODESET));
     for (p = def_mailsub; *p; p++) {
 	/* Expand escapes in the subject */
 	if (*p == '%' && *(p+1) != '%') {