crond[pid]: postdrop: warning: mail_queue_enter: create file maildrop/数字: Permission denied
chmod 1777 /var/spool/postfix/maildrop
chmod 1777 /var/spool/postfix/public
chmod 1777 /var/spool/postfix/public/pickup
crontab -e
首行添加
MAILTO=""
对应定时任务后面添加 &> /dev/null