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:
The Reply-To: header should never be declared in
the configuration file.