sendmail, 4th Edition

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

Each time 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 (Timeout 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. When the remote site comes back up, you can later process the files in that other queue by running sendmail with an artificially long Timeout.queuereturn value (Process Alternative Queues on page 436).

A second way to extend the life of messages in the queue is to edit the qf file and change the value stored in the T line. Just add 86400 to that value for each day you want to extend. ...