sendmail error

Linux and Unix-Like Red Hat
1

Hi,

Need help here in sendmail error encountered

[root@dot-123-my-server mail]# tail /var/log/maillog
Aug 18 16:36:01 dot-123-my-server sendmail[1124]: q7IKa1GJ001123: to=<munin@dot-123-my-server>, ctladdr=<munin@dot-123-my-server> (101/102), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30898, dsn=2.0.0, stat=Sent
Aug 18 16:40:01 dot-123-my-server sendmail[3341]: My unqualified host name (dot-123-my-server) unknown; sleeping for retry
Aug 18 16:41:02 dot-123-my-server sendmail[3341]: unable to qualify my own domain name (dot-123-my-server) -- using short name
Aug 18 16:41:02 dot-123-my-server sendmail[3341]: q7IKf2Cr003341: from=munin, size=381, class=0, nrcpts=1, msgid=<201208182041.q7IKf2Cr003341@dot-123-my-server>, relay=munin@localhost
Aug 18 16:41:02 dot-123-my-server sendmail[4023]: q7IKf2kQ004023: from=<munin@dot-123-my-server>, size=661, class=0, nrcpts=1, msgid=<201208182041.q7IKf2Cr003341@dot-123-my-server>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Aug 18 16:41:02 dot-123-my-server sendmail[3341]: q7IKf2Cr003341: to=munin, ctladdr=munin (101/102), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30381, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (q7IKf2kQ004023 Message accepted for delivery)
Aug 18 16:41:02 dot-123-my-server sendmail[4024]: q7IKf2kQ004023: forward /var/lib/munin/.forward.dot-123-my-server: World writable directory
Aug 18 16:41:02 dot-123-my-server sendmail[4024]: q7IKf2kQ004023: forward /var/lib/munin/.forward: World writable directory
Aug 18 16:41:02 dot-123-my-server sendmail[4024]: q7IKf2kQ004023: to=<munin@dot-123-my-server>, ctladdr=<munin@dot-123-my-server> (101/102), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30898, dsn=2.0.0, stat=Sent
Aug 18 16:45:02 dot-123-my-server sendmail[6192]: My unqualified host name (dot-123-my-server) unknown; sleeping for retry
2

First reaction.
Try putting your fully-qualified host name in /etc/hosts on the same line as the existing line containing the IP address for this computer. Just separate the unqualified name and the qualified name with a space character.
Your fully-qualified host name will be of the form machinename@domain.com .

Ps. Please always post what Operating System and version you are running (avoiding vague term such as "unix" and "Linux"). There are umpteen different ones.

3 
Linux version 2.6.18-238.9.1.el5.goPAE (root@superv) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Thu Apr 28 05:24:24 EDT 2011

[root@dot-123-my-server ~]# less /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               localhost.localdomain localhost
127.0.0.1               go.goautodial.org
X.X.X.X          dot-123-my-server.domain.com
X.X.X.X << the HOST IP

Error still encountered Please help