当Cron执行命令出错时，默认会发送邮件给cron任务的所有者．当然，发送邮件时也可能会出错．我就遇到了如题所示的错误．
我使用的机器环境为Centos7.它默认会使用Postfix来发送邮件．
#tail /var/log/cron
Feb 24 16:37:16 iZbp16mm6oot8Z CROND[20862]: (root) MAIL (mailed 317 bytes of output but got status 0x004b#012)
Feb 24 16:37:21 iZbp16mm6oot8Z CROND[20861]: (root) MAIL (mailed 317 bytes of output but got status 0x004b#012)
Feb 24 16:37:26 iZbp16mm6oot8Z CROND[20860]: (root) MAIL (mailed 317 bytes of output but got status 0x004b#012)
Feb 24 16:37:31 iZbp16mm6oot8Z CROND[20859]: (root) MAIL (mailed 317 bytes of output but got status 0x004b#012)
Feb 24 16:37:36 iZbp16mm6oot8Z CROND[20858]: (root) MAIL (mailed 317 bytes of output but got status 0x004b#012)
#cat /var/log/maillog
Feb 24 16:36:06 iZbp16mm6oot8Z postfix/sendmail[20327]: fatal: parameter inet_interfaces: no local interface found for ::1
Feb 24 16:36:11 iZbp16mm6oot8Z postfix/sendmail[20386]: fatal: parameter inet_interfaces: no local interface found for ::1
Feb 24 16:36:16 iZbp16mm6oot8Z postfix/sendmail[20434]: fatal: parameter inet_interfaces: no local interface found for ::1
Feb 24 16:36:21 iZbp16mm6oot8Z postfix/sendmail[20481]: fatal: parameter inet_interfaces: no local interface found for ::1
Feb 24 16:36:26 iZbp16mm6oot8Z postfix/sendmail[20534]: fatal: parameter inet_interfaces: no local interface found for ::1
Feb 24 16:36:31 iZbp16mm6oot8Z postfix/sendmail[20570]: fatal: parameter inet_interfaces: no local interface found for ::1
Feb 24 16:36:36 iZbp16mm6oot8Z postfix/sendmail[20614]: fatal: parameter inet_interfaces: no local interface found for ::1
Feb 24 16:36:41 iZbp16mm6oot8Z postfix/sendmail[20660]: fatal: parameter inet_interfaces: no local interface found for ::1
Feb 24 16:36:46 iZbp16mm6oot8Z postfix/sendmail[20711]: fatal: parameter inet_interfaces: no local interface found for ::1
vi /etc/postfix/main.cf
发现配置为：
inet_interfaces = localhost
inet_protocols = all
改成：
inet_interfaces = all
inet_protocols = all
重新启动
service postfix start
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这个其实是postfix的配置问题，是计划任务在执行完之后会通过postfix发邮件给执行完的用户邮箱，现在发不出去导致的，修改下配置就行了，但是与本次错误无关。
也可以设置下定时器执行后不发邮件
# crontab -e
MAILTO="" #设置MAILTO参数为空
*/1 * * * * curl http://dr.host.com/cronTab/queryCurrentBill
3 4 * * * curl http://dr.host.com/cronTab/yesterDayOrders
* * * * * curl http://dr.host.com/cronTab/queryLastMonthOrder
* * * * * sleep 5; curl http://dr.host.com/cronTab/queryLastMonthOrder
* * * * * sleep 10; curl http://dr.host.com/cronTab/queryLastMonthOrder
* * * * * sleep 15; curl http://dr.host.com/cronTab/queryLastMonthOrder
* * * * * sleep 20; curl http://dr.host.com/cronTab/queryLastMonthOrder
* * * * * sleep 25; curl http://dr.host.com/cronTab/queryLastMonthOrder
这样就再也不会发邮件了。。。。。。当然也不会有那个错误了。