crond 引起大量sendmail进程

ps -u common

common   31446 31377  0 20:20 ?       /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t -f root

ps -ef|grep "/usr/sbin/sendmail"|grep -v grep |awk '{print $2}'|xargs kill 

ps -ef|grep 31337

postfix/postdrop[23110]: warning: mail_queue_enter: create file maildrop/749274.23110: No such file or directory

man 5 crontab
    In  addition  to  LOGNAME,  HOME, and SHELL, cron(8) will look at MAILTO if it has any reason to send
 mail as aresult of running commands in "this" crontab.  If MAILTO is defined (and non-empty), mail is 
sent to  the  userso  named.   If  MAILTO  is defined but empty (MAILTO=""), no mail will be sent.  
Otherwise mail is sent to the owner of the crontab.  This option is useful if you decide on /bin/mail
 instead of  /usr/lib/sendmail  as  your mailer when you install cron -- /bin/mail doesn′t do aliasing, 
and UUCP usually doesn′t read its mail. If MAIL-FROM is defined (and non-empty), 
it will be used as the envelope sender address, otherwise,  ‘‘root’’  will  be used.