- Add workaround for some Outlook's wrong content-types, per discussion in #1487051

program/steps/mail/func.inc

@@ -1717,6 +1717,16 @@ function rcmail_user_date()
   return $date;
 }
 
+// Fixes some content-type names
+function rcmail_fix_mimetype($name)
+{
+  // Some versions of Outlook create garbage Content-Type:
+  // application/pdf.A520491B_3BF7_494D_8855_7FAC2C6C0608
+  if (preg_match('/^application\/pdf.+/', $name))
+    $name = 'application/pdf';
+
+  return $name;
+}
 
 function rcmail_search_filter($attrib)
 {

program/steps/mail/get.inc

@@ -91,6 +91,7 @@ else if ($pid = get_input_value('_part', RCUBE_INPUT_GET)) {
       header("Content-Type: text/$ctype_secondary; charset=" . ($part->charset ? $part->charset : RCMAIL_CHARSET));
     }
     else {
+      $mimetype = rcmail_fix_mimetype($mimetype);
       header("Content-Type: $mimetype");
       header("Content-Transfer-Encoding: binary");
     }

program/steps/mail/show.inc

@@ -172,7 +172,7 @@ function rcmail_message_attachments($attrib)
               'return %s.command(\'load-attachment\',{part:\'%s\', mimetype:\'%s\'},this)',
               JS_OBJECT_NAME,
               $attach_prop->mime_id,
-              $attach_prop->mimetype),
+              rcmail_fix_mimetype($attach_prop->mimetype)),
               'title' => Q($title),
             ),
             Q($filename)));