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450 | Chapter 11: Manage the Queue
If an alias expands to a program or a file (text that begins with a / or | character), that text
is sent out in the delivered message??™s Errors-To: line in that form. This can cause confusion
when the message is later processed and bounced at the receiving site.
11.12.7 F line
Saved flag bits V8.1 and later
Under V8 sendmail, th eTimeout.queuewarn option (?§24.9.119 on page 1097) can specify an
interval to wait before notifying the sender that a message could not immediately be delivered.
To keep track of whether such a notification has been sent, sendmail stores the state
of its EF_WARNING envelope flag in the qf file. If that flag is set, notification has already
been sent.
Error mail messages sent by sendmail can occasionally be queued, rather than immediately
delivered. The Timeout.queuewarn option notification should not be sent for such mail. If
such mail remains in the queue too long, it should be canceled rather than bounced. V8
sendmail saves the state of the EF_RESPONSE envelope flag in the qf file. If that flag is set,
the message is an error notification.
Beginning withV8.8, sendmail also records the state of the EF_HAS8BIT flag (the message
body contains 8-bit data) and the EF_DELETE_BCC flag (delete empty Bcc: headers,
?§25.
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