Recently when I inspect server logs found that some mail logs as follows

Mar 15 02:15:01 xxx sendmail[7809]: q2EKj1XX007809: from=root, size=338, class=0, nrcpts=1, msgid=<201203142045.q2EKj1XX007809@xxx.xxxxr>, relay=amitha@localhost
Mar 15 02:15:01 xxx sendmail[7810]: q2EKj1XG007810: from=<root@xxx.xxxx>, size=663, class=0, nrcpts=1, msgid=<201203142045.q2EKj1XX007809@xxx.xxxx>, proto=ESMTP, daemon=MTA, relay=xxx.xxxx []
Mar 15 02:15:01 xxxsendmail[7809]: q2EKj1XX007809: to=amitha, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30338, relay=[] [], dsn=2.0.0, stat=Sent (q2EKj1XG007810 Message accepted for delivery)
Mar 15 02:15:01 xxx sendmail[7811]: q2EKj1XG007810: to=<amitha@cweb.ctracker>, ctladdr=<root@xxx.xxxx> (0/0), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30862, dsn=2.0.0, stat=Sent
Mar 15 08:24:53 xxx sendmail[1579]: starting daemon (8.14.4): SMTP+queueing@01:00:00
Mar 15 08:24:53 xxx sm-msp-queue[1588]: starting daemon (8.14.4): queueing@01:00:00
This seems internal mail realy thing hence it shows loopback address. Do I have to take some precautions?