25.12.31 References:
Reference to original message RFC2822
The References: header is used by mail-reading programs to include a reference to the original
message in replies. This header must have as its value a copy of the original Message-
ID: header field:
References: <200210141542.g9EFg2bb006638@wash.dc.gov>
Notice that the message identifier is wrapped in angle brackets, which causes it to look like
an address.
The References: header should never be declared in the configuration file.
25.12.32 Reply-To:
Alternative reply address RFC2822
The Reply-To: header requests that replies to messages go to an address that is different
from that of the original sender. This header is usually inserted by mailing-list software,
where the From: is the address of the author of the message and the Reply-To: is the address
of the list.
The field for the Reply-To: header must obey the same rules as those for the From: header??™s
field. One example of the use of this header might look like this:
From: bob@list.server.domain
Reply-To: mailinglist@list.server.domain
The Reply-To: header should never be declared in the configuration file.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
25.12 Alphabetized Header Reference | 1165
25.12.33 Return-Path:
Return address of sender RFC2822
The Return-Path: header is intended to show the envelope address of the real sender as
opposed to the sender used for replying (the From: and Reply-To: headers).
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