Yaroslav Tykhiy 6fcf85bc95 Document the -d flag to mail(1) better, which comes handy when
you want to see, e.g., sendmail arguments mail(1) will use.

-H is not an independent flag, it's a modifier.  Also explicitly
say that -H will cause mail(1) to exit as soon as it prints the headers.

MFC after:	5 days
2005-10-07 10:16:41 +00:00
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