How to view Mail Queue headers/content?

I’m concerned that the messages in our outgoing mail queue labeled as being from MAILER-DAEMON are NOT just bounce notifications…for one thing, the recipient is almost always listed as being someone in the ourside world, possibly a bogus address.
Sometimes, we get a huge number of them.
How can I view the headers or the content of the messages themselves? The server admin only lets you see something called ‘message details’ which gives me the ID…but then what do I do with that to see something substantive?
This is with Tiger Server 10.4.8, by the way…thanks.