basic mail

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Author: Eric
Date:  
Subject: basic mail
THis is a lob, I guess, but here goes:
Let's say that I try to send a message in mutt, but do so before I
have properly configured sendmail. The failure to properly
configure it causes my messages to look like they are coming
<my_computer_name@localdomain>. Sendmail doesn't like this, so 4 hours later
it sends me a warning stating that it was unable to send my message because
it did not like my address, but that it will try later to send the same
message.

What I want to do is go find that message and prevent sendmail from sending it.
Where is that message; i.e., how do I find it so I can delete it and
prevent sendmail from sending it?

Thanks,

Eric