12.12 on page 452.)
The time stored in the K line looks like this:
K703531020
This number represents the date and time in seconds since January 1, 1970. Every time the
qf file is processed (delivery is attempted), the K line is updated with the current time.
11.12.11 M line
Why the message was queued All versions of sendmail
When a mail message is placed into the queue because of an error during the delivery
attempt, the nature of that error is stored in the M line of the qf file. The error is usually
prefixed with Deferred:
Deferred: reason
Delivery can be deferred until a later queue run because of a temporary lack of services. For
example, the reason might be ???remote host is down.???
The form of the qf file M line is:
Mmsg
The M must begin the line. It is immediately followed by the msg withno intervening space.
The text of msg is everything up to the end of the line. The msg created by sendmail can
include the word Deferred: followed by a reason. The envelope-specific M line should
appear before the S line.
Beginning with V8.12, each recipient also has an M line preceding its R line.
If the msg is missing, sendmail simply prints a blank line rather than a reason when showing
the queue with mailq or the -bp command-line switch. If the M line is missing entirely, sendmail
prints nothing.
The maximum number of characters in msg is defined by MAXLINE in conf.
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