I recently installed the "hello" package on my Ubuntu laptop, and then I saw
that "hello --help" mentions a "-m" option with the mention "read your
mail". However, typing "hello -m" reports that the option is invalid.
Furthermore, "-m" is absent from hello's manpage.
Thanks for the report, but I think you found a bug in Ubuntu's "port" of
Hello, not the upstream GNU Hello. You don't mention any version
numbers, but the current GNU hello --help does not mention -m.