當Cron執行命令出錯時，默認會發送郵件給cron任務的所有者．當然，發送郵件時也可能會出錯．我就遇到了如題所示的錯誤．
我使用的機器環境為Centos7.它默認會使用Postfix來發送郵件．
#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
發現配置為：
inet_interfaces = localhost
inet_protocols = all
改成：
inet_interfaces = all
inet_protocols = all
重新啟動
service postfix start
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這個其實是postfix的配置問題，是計划任務在執行完之后會通過postfix發郵件給執行完的用戶郵箱，現在發不出去導致的，修改下配置就行了，但是與本次錯誤無關。
也可以設置下定時器執行后不發郵件
# crontab -e
MAILTO="" #設置MAILTO參數為空
*/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
這樣就再也不會發郵件了。。。。。。當然也不會有那個錯誤了。