SNDDST trouble-shooting

     We are running an AS/400 V3R2 with JustMail/400 and TCP/IP SMTP which 
     is connected to our "official" corporate e-mail system (cc:Mail).  
     I've automated several distribution-type functions such as sending a 
     data file to an external customer by using SNDDST ...
     
     My problem is this:
     
          Occasionally the message doesn't reach the recipient and 
          nobody on our staff is aware of it either.
          
          Every time we notice it [or worse yet, when one of our 
          CUSTOMERs notices it] I check with our cc:Mail 
          administrator, we plunk around a little, try it again, etc.  
          The normal pattern is that he says that cc:Mail isn't 
          "seeing it come across", we each try some other 
          options/settings/etc and then it starts working again 
          [without really knowing what was wrong or what fixed it].
          
          Are there any tools available [hopefully at least somewhat 
          programmer-friendly ones] to determine the EXACT state of a 
          message that is sent through a network such as this.  I'm 
          really just trying to pinpoint that the AS/400 has either 
          SENT or NOT SENT the message [and of course WHY if the 
          answer is NOT SENT].
          
     Thanks in advance.
     
     Mark Stepan
     Merrill/May
     St Cloud, Minnesota USA
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