i often dont have messages sent, they sit in the que like this:

pork% mailq
                Mail Queue (1 request)
--Q-ID-- --Size-- -----Q-Time----- ------------Sender/Recipient------------
UAA07823      113 Mon Apr 28 20:44 ingerrn
                 (Deferred: 450 <ingerrn@crispy.pork>... Sender domain 
not fou)
                                   Pidgeongrl@aol.com

how do i fix this?
-xiamin