I'm getting these notices in the daily output:

mail:
		/var/spool/mqueue (4 requests)
----Q-ID---- --Size-- -----Q-Time----- ------------Sender/Recipient------------
eAABTrE01158       50 Fri Nov 10 03:29 root
                  (host map: lookup (hotzsun.jpl.nasa.gov): deferred)
				       hotzmail@hotzsun.jpl.nasa.gov
f0NBbiw14521       50 Tue Jan 23 03:37 root
                  (host map: lookup (hotzsun.jpl.nasa.gov): deferred)
				       hotzmail@hotzsun.jpl.nasa.gov
eAABFUE00568     2207 Fri Nov 10 03:15 root
                  (host map: lookup (hotzsun.jpl.nasa.gov): deferred)
				       hotzmail@hotzsun.jpl.nasa.gov
f0NBFEj13930     2780 Tue Jan 23 03:15 root
                  (host map: lookup (hotzsun.jpl.nasa.gov): deferred)
				       hotzmail@hotzsun.jpl.nasa.gov

I don't know what they mean.  /var/mail is completely empty.  Are 
they messages that never got delivered?  Messages that just had 
hiccups?  I suppose there is some kind of cleanup that I'm supposed 
to do, but why is my intervention required?

Sendmail is one of those packages that I just want to forget about 
because it's so complex in relation to the functionality of interest. 
Bad attitude, I know.  Should I switch to postfix?

Signature held pending an ISO 9000 compliant
signature design and approval process.
h.b.hotz@jpl.nasa.gov, or hbhotz@oxy.edu