Hi David,
I have looked at the log file and the problem is that my mail server is rejecting root's email address (root@localhost) coz no such user exists on my mail server (10.0.0.2). Also note that I have edited the aliases file, assigned an email address that exists on the mail server to root and ran newalises but I don't know why it's still sending to root.
below is an extract from my maillog.
May 19 04:05:23 myhost sendmail[29250]: o4J15H5M029250: from=root, size=1183, class=0, nrcpts=1, msgid=<201005190105.o4J15H5M029250@myhost.example.co.ke>, relay=root@localhost
May 19 04:05:23 myhost sendmail[29250]: o4J15H5M029250: to=root, ctladdr=root (0/0), delay=00:00:06, xdelay=00:00:00, mailer=relay, pri=31183, relay=[10.0.0.2] [10.0.0.2], dsn=5.1.1, stat=User unknown
May 19 04:05:23 myhost sendmail[29250]: o4J15H5M029250: o4J15H5N029250: DSN: User unknown
May 19 04:05:23 myhost sendmail[29250]: o4J15H5N029250: to=root, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=32207, relay=[10.0.0.2] [10.0.0.2], dsn=5.1.1, stat=User unknown
May 19 04:05:23 myhost sendmail[29250]: o4J15H5N029250: o4J15H5O029250: return to sender: User unknown
May 19 04:05:23 myhost sendmail[29250]: o4J15H5O029250: to=postmaster, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=33231, relay=[10.0.0.2] [10.0.0.2], dsn=5.1.1, stat=User unknown
May 19 04:05:23 myhost sendmail[29250]: o4J15H5N029250: Losing ./qfo4J15H5N029250: savemail panic
May 19 04:05:23 myhost sendmail[29250]: o4J15H5N029250: SYSERR(root): savemail: cannot save rejected email anywhere