Sender:
The real sender RFC2822
The Sender: header
is like the From:
header. But whereas the From: header shows the address of one
sender (RFC822) or many authors (RFC2822), the
Sender: header
shows the address of the actual
sender. For example, an assistant can mail a letter
for the boss using the boss’s account. The boss’s
address is in the From: header, and the assistant’s
address is in the Sender: header. See the From: header (From: on page 1157) for a
description of the syntax and rules for this
Sender:
header.
Newer MUAs allow the user to create a custom Sender: header. The
Sender: header
should never be declared in the configuration
file.
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