MDaemon發生maildrop already lock的錯誤,是同時兩個裝置使用POP收信造成,參考網址如下。
REF: http://blog.752club.com/mdaemon-multi-pc-receive-pop3-account/

cat /private/var/log/system.log | grep "Failed to authenticate"
Feb 11 16:48:04 g authorizationhost[15313]: Failed to authenticate user (error: 9).
Feb 11 16:48:06 g authorizationhost[15313]: Failed to authenticate user (error: 9).