<=   message arrival
=>   normal message delivery
->   additional address in same delivery
*>   delivery suppressed by -N
**   delivery failed; address bounced
==   delivery deferred; temporary problem
<>   bounced message
A    authenticator name (and optional id)
C    SMTP confirmation on delivery
command list for “no mail in SMTP session”
CV   certificate verification status
D    duration of “no mail in SMTP session”
DN   distinguished name from peer certificate
DT on => lines: time taken for a delivery
F    sender address (on delivery lines)
H    host name and IP address
I    local interface used
id   message id for incoming message
P on <= lines: protocol used
on => and ** lines: return path
QT on => lines: time spent on queue so far
on “Completed” lines: time spent on queue
R on <= lines: reference for local bounce
on => ** and == lines: router name
S   size of message
ST  shadow transport name
T on <= lines: message subject (topic)
on => ** and == lines: transport name
U   local user or RFC 1413 identity
X   TLS cipher suite

Clear the exim mail queue

/usr/sbin/exim -Mrm `ls /var/spool/exim/input/ | grep -- -H$ | cut -c 1-16`