postcat
-b Show body content.
-h Show message header content.
-q Search the Postfix queue for the named files instead of taking the names literally.
postsuper
-d MSGID
-d ALL
flush
postqueue
-f
show the headers of all queued messages
mailq | awk '/^[A-F0-9]+\s+/ {print $1}' | while read id; do echo $id; postcat -h -q $id;