simplify names

conf/app.ini

@@ -115,7 +115,7 @@ PAGING_NUM = 10
 [mailer]
 ENABLED = false
 ; Buffer length of channel, keep it as it is if you don't know what it is.
-SEND_BUFFER_LEN = 10
+SEND_BUFFER_LEN = 100
 ; Name displayed in mail title
 SUBJECT = %(APP_NAME)s
 ; Mail server