IOError instead of RuntimeError
diff --git a/Demo/scripts/from.py b/Demo/scripts/from.py
index 394af8d..3213aea 100755
--- a/Demo/scripts/from.py
+++ b/Demo/scripts/from.py
@@ -16,7 +16,7 @@
 
 try:
 	mail = open(mailbox, 'r')
-except RuntimeError:
+except IOError:
 	sys.stderr.write('Cannot open mailbox file: ' + mailbox + '\n')
 	sys.exit(2)