my %_cmds = (
    DATA => \&_data,
    EXPN => \&_noway,
    HELO => \&_hello,
    HELP => \&_help,
    MAIL => \&_mail,
    NOOP => \&_noop,
    QUIT => \&_quit,
    RCPT => \&_receipt,
    RSET => \&_reset,
    VRFY => \&_noway
    );