Como resolver el error "[ID 702911 mail.crit] My unqualified host name (hostname) unknown" / "[ID 702911 mail.alert] unable to qualify my own domain name (hostname) -- using short name"

Como resolver el error "[ID 702911 mail.crit] My unqualified host name (hostname) unknown" / "[ID 702911 mail.alert] unable to qualify my own domain name (hostname) -- using short name"

Este error suele aparecer por una causa muy sencilla, el archivo /etc/hosts no tiene el dominio correspondiente al nombre del hosts.

Nuestra entrada debería lucir de esta manera:
172.24.0.200    localzone    localzone.xyzcorp.ad  loghost

Y no de esta:
172.24.0.200    localzone    loghost

Esta sencilla modificación resolvería el error.

[root@localzone:] dmesg

Wed Aug 17 12:28:49 ART 2016

Jul 22 13:10:58 localzone sendmail[1435]: [ID 702911 mail.crit] My unqualified host name (localzone) unknown; sleeping for retry

Jul 22 13:11:58 localzone sendmail[1438]: [ID 702911 mail.alert] unable to qualify my own domain name (localzone) -- using short name

Jul 22 15:17:45 localzone sendmail[14095]: [ID 702911 mail.crit] My unqualified host name (localzone) unknown; sleeping for retry

Jul 26 15:16:07 localzone sendmail[16570]: [ID 702911 mail.crit] My unqualified host name (localzone) unknown; sleeping for retry

Jul 26 15:17:07 localzone sendmail[16570]: [ID 702911 mail.alert] unable to qualify my own domain name (localzone) -- using short name

Aug  3 15:56:36 localzone sendmail[21510]: [ID 702911 mail.crit] My unqualified host name (localzone) unknown; sleeping for retry

Aug  3 15:57:36 localzone sendmail[21510]: [ID 702911 mail.alert] unable to qualify my own domain name (localzone) -- using short name

Aug  5 10:33:21 localzone sendmail[10440]: [ID 702911 mail.crit] My unqualified host name (localzone) unknown; sleeping for retry

Aug  5 10:34:21 localzone sendmail[10440]: [ID 702911 mail.alert] unable to qualify my own domain name (localzone) -- using short name

[root@localzone:] exit

[Connection to zone 'localzone' pts/5 closed]

[root@globalzone ~]# zlogin localzone

[Connected to zone 'localzone' pts/5]

Last login: Wed Aug 17 12:28:47 on pts/5

Oracle Corporation      SunOS 5.10      Generic Patch   January 2005

You have new mail.

[root@localzone:] cat /etc/hosts

#

# Internet host table

#

::1     localhost

127.0.0.1       localhost

172.24.0.200    localzone    localzone.xyzcorp.ad  loghost

172.24.1.200    localzone_mgt

#ASR SERVER

198.232.168.156 transport.sun.com

192.18.110.18   inv-cs.sun.com

172.24.0.71     smtp.xyz.com

#

172.24.1.6 BKPSRV0040301 BKPSRV0040301.xyzcorp.ad

172.25.1.6 BKPSRV0020001 BKPSRV0020001.xyzcorp.ad

[root@localzone:]