postcat
You can use postcat to view the contents of mail in the queue. First you will need to see a list of mail queue IDs with mailq command:

mailq

A48B0794BF3

Once you have the queue ID you may view the contents with:

# postcat -q A48B0794BF3

Run the mailq command to see if any mail is in the queue. Try to locate queue IDs. If there is no mail in the queue then try to pick out mail IDs in the /var/mail directory.

cat /var/mail/username