(Mail Format): Replace "Sender" with "Message-Id", since
the former is not always used. (Mail Headers): Use active voice. Add "Mail-reply-to". Change case of "Id". Avoid repeated "appropriate". (Mail Aliases): Fix previous change - use an example with a ".", so it does actually get quoted when expanded. (Mail Sending): Mailclient is the default on some systems. (Citing Mail): Mention mail-indentation-spaces. (Mail Mode Misc): Add an @dfn for "mail signature".
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