Index: mimemail.inc
===================================================================
RCS file: /cvs/drupal/contributions/modules/mimemail/mimemail.inc,v
retrieving revision 1.40
diff -u -r1.40 mimemail.inc
--- mimemail.inc	23 Feb 2009 16:11:19 -0000	1.40
+++ mimemail.inc	14 Mar 2010 20:35:24 -0000
@@ -123,7 +123,7 @@
     }
   }
 
-  if ($file && file_exists($file)) {
+  if (isset($file) && @file_exists($file)) {
     // Prevent duplicate items
     if (isset($filenames[$file])) return 'cid:'. $filenames[$file];
     
@@ -210,7 +210,7 @@
       $part_headers['Content-Disposition'] = 'inline';
     }
 
-    if ($part['Content-Transfer-Encoding']) {
+    if (isset($part['Content-Transfer-Encoding'])) {
       $part_headers['Content-Transfer-Encoding'] = $part['Content-Transfer-Encoding'];
     }