4.75 on page 150), the sender address
can optionally be rewritten by the User Database before it is placed into the S line. Such
rewriting is allowed only if the delivery agent for the sender includes the F=i flag (?§20.8.29
on page 772).
11.12.19 T line
Time created All versions of sendmail
To limit the amount of time a message can remain in the queue before being bounced,
sendmail must know when that message was first placed in the queue. That time of first
placement is stored in the T line in the qf file. For example, the following number represents
the date and time in seconds since January 1, 1970:
T703531020
Eachtime sendmail fails to deliver a message from the queue, it checks to see whether too
much time has passed. It adds the T line value to the value specified in the
Timeout.queuereturn option (?§24.9.119 on page 1097). If that sum is greater than the
current time, the message is bounced instead of being left in the queue.
Messages are occasionally left in the queue for longer than the normal timeout period. This
might happen, for example, if a remote machine is down but you know that it will eventually
be brought back up. There are two ways to lengthen the amount of time a message can
remain in the queue.
The preferred way is to create a temporary separate queue directory and move the necessary
queued file to that temporary holding place.
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