discard messages shorter than 100 bytes

etc/example.conf

@@ -74,6 +74,9 @@ workdir=/var/piler/tmp
 ; whether to enable writing folder_message table (1) or not (0)
 enable_folders=0
 
+; discard a message if it's shorter than this value (in bytes)
+min_message_size=100
+
 ;
 ; starttls stuff
 ;