It will have more information than that. For example, I currently have one message in the queue.
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connect to mail-sunshine.com[204.11.56.48]:25: Connection timed out
What does yours show? Are all the hosts the same? Or are all the queued messages going to the same host?
Try pinging the hosts. Are they up?
Try telnetting to port 25 on the hosts, does it respond?
In my case, the host appears to be up, but it does not respond to port 25 which means something is wrong from their side, not my side - or the email address is wrong somehow.