🚀 go-pugleaf

If I want my own From: header with, say, 

	my_hdr From: Fletcher Mattox <fletcher@cs.utexas.edu>

then mush 7.1.2 puts no From: in my $record.  Though it happily
sends the custom From:, as expected, to the MTA.  Why is that?

The code in add_headers() seems to intentionally wipe out the
buffer after writing to the MTA with ...

	if (own_from)
	    (void) fputs(own_from, files[i]), *own_from = 0;
	else
	    (void) fputs(From_buf, files[i]);