Apparently-From:
The unknown sender send mail
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. It
shouldn’t cause problems because a good sender
address still appears in the SMTP envelope.
The Apparently-From: header should never be
declared in the configuration file and should not be
added to conf.c.
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