Whenever the delivery status of a mail
message changes, sendmail logs the event and
includes the stat= to specify why the change
happened. For example, a mail message might initially be queued
because the recipient's host was down:
stat=queued
Later it might change again because it succeeded in being delivered:
stat=Sent (HAA03001 Message accepted for delivery)
In transmitting a mail message via SMTP the stat=
will include the actual text that the other host printed when it
accepted the mail message, as shown earlier. But in delivering
locally, the stat= is more succinct:
stat=Sent
In the case of bounced mail the stat= will show
the reason for failure:
stat=User unknown
The stat= syslog equate is
included only in recipient records.
