Handy sendmail debugging commands

Some sendmail commands I’ve just found useful, but couldn’t locate on Google.

Get the current status of a message in the queue: grep  'james@example.com' /var/log/maillog

Get the headers for an email: cat /var/spool/mqueue/qf[message ID]

Get the body of an email: cat /var/spool/mqueue/df[message ID]

(Many thanks to my old friend Mr Matt Westby for his help with this.)