: send_mail( mailsrc, from_addr, *to_addrs )
    mailsrc ᡼Ȥޤmailsrc  each ƥ졼
    ֥ȤʤʤǤ⹽ޤ (Ȥ String  File)
    from_domain Υ᡼륢ɥ쥹 ('...@...'ΤΤ) ǡ
    to_addrs ˤ᡼륢ɥ쥹¤٤ޤ

        # example
        Net::SMTP.start( 'your.smtp.server' ) {|smtp|
            smtp.send_mail mail_string,
                           'from@mail.address',
                           'dest@mail.address' 'dest2@mail.address'
        }

