Re: Sending attachments

[Richard Stallman]

    The purpose is to display the mail message more like it would be sent.

    > What does this do?

    Removing/adding suitable headers, stripping mail-header-separator,
    sorting headers.

I see that that is true as regards mail-header-separator.
However, the rest seems not to be right for Mail mode.
It looks like this code is written only for use in Gnus.