- Made sure non US-ASCII mails are sent out properly. Patch by Gabor.

TODO: rename user_mail() to drupal_mail() and move it to common.inc.
  Other modules, such as the project module, should use this as well
  or they risk to send out /invalid/ mails.

modules/user.module

@@ -311,10 +311,39 @@ function user_mail($mail, $subject, $message, $header) {
     ** http://www.rfc-editor.org/rfc/rfc2646.txt
     **
     */
-    return mail($mail, $subject, str_replace("\r", "", $message), $header);
+    return mail(
+      $mail,
+      user_mail_encode($subject),
+      str_replace("\r", "", $message),
+      "MIME-version: 1.0\nContent-type: text/plain; charset=UTF-8; format=flowed\nContent-transfer-encoding: 8BIT\n" . $header
+    );
   }
 }
 
+// Original code by <gordon at kanazawa-gu dot ac dot jp>
+function user_mail_encode($string) {
+
+  // define start delimimter, end delimiter and spacer
+  $end    = "?=";
+  $start  = "=?UTF-8?B?";
+  $spacer = "{$end}\r\n{$start}";
+
+  // determine length of encoded text within
+  // chunks and ensure length is even
+  $length = 75 - strlen($start) - strlen($end);
+  $length = floor($length/2) * 2;
+
+  // encode the string and split it into chunks
+  // with spacers after each chunk
+  $string = base64_encode($string);
+  $string = chunk_split($string, $length, $spacer);
+
+  // remove trailing spacer and add start and end delimiters
+  $spacer = preg_quote($spacer);
+  $string = preg_replace("/{$spacer}$/", "", $string);
+  return ($start . $string . $end);
+}
+
 function user_deny($type, $mask) {
 
   $allow = db_fetch_object(db_query("SELECT * FROM {access} WHERE status = '1' AND type = '%s' AND LOWER('%s') LIKE LOWER(mask)", $type, $mask));

modules/user/user.module

@@ -311,10 +311,39 @@ function user_mail($mail, $subject, $message, $header) {
     ** http://www.rfc-editor.org/rfc/rfc2646.txt
     **
     */
-    return mail($mail, $subject, str_replace("\r", "", $message), $header);
+    return mail(
+      $mail,
+      user_mail_encode($subject),
+      str_replace("\r", "", $message),
+      "MIME-version: 1.0\nContent-type: text/plain; charset=UTF-8; format=flowed\nContent-transfer-encoding: 8BIT\n" . $header
+    );
   }
 }
 
+// Original code by <gordon at kanazawa-gu dot ac dot jp>
+function user_mail_encode($string) {
+
+  // define start delimimter, end delimiter and spacer
+  $end    = "?=";
+  $start  = "=?UTF-8?B?";
+  $spacer = "{$end}\r\n{$start}";
+
+  // determine length of encoded text within
+  // chunks and ensure length is even
+  $length = 75 - strlen($start) - strlen($end);
+  $length = floor($length/2) * 2;
+
+  // encode the string and split it into chunks
+  // with spacers after each chunk
+  $string = base64_encode($string);
+  $string = chunk_split($string, $length, $spacer);
+
+  // remove trailing spacer and add start and end delimiters
+  $spacer = preg_quote($spacer);
+  $string = preg_replace("/{$spacer}$/", "", $string);
+  return ($start . $string . $end);
+}
+
 function user_deny($type, $mask) {
 
   $allow = db_fetch_object(db_query("SELECT * FROM {access} WHERE status = '1' AND type = '%s' AND LOWER('%s') LIKE LOWER(mask)", $type, $mask));