If a
macro is not in that class, its value will not survive queueing, and the included
header might not appear when delivered from the queue.
25.12 Alphabetized Header Reference
Some header lines need to be declared in the configuration file by using the H command.
Others are created internally by sendmail. Still others are created by mail
MUAs. These differences are described individually with each header-line name. Th e
following discussion of header names is in alphabetical order.
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25.12 Alphabetized Header Reference | 1151
25.12.1 Apparently-From:
The unknown sender Smail
The Smail 3.x program (a UUCP-oriented replacement for sendmail) produces an
Apparently-From: header when it is unable to find any of the official sender headers in a
mail message. The address that it provides to this nonstandard header is taken from the
envelope of the message.
The sendmail program, on the other hand, places the envelope sender into a From: header
in this situation. If there is no envelope sender and if the sender was not specified in the
command line, sendmail sets the sender to be the postmaster.
The Apparently-From: header is mentioned here only because it can appear in messages
received at sites that run sendmail.
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