problem reporting "from email address :"

[roger-q-l]

        I'm using forkserver 0.32

        I see in the logs that what is reported (per the subject line) is
different from what I pull when I try something like this:

        I'll first register the "mail" hook, then:

my ( $self, $transaction, $mail )   = @_ ;
my $address = lc ( $mail->address ) ;
$self->log ( 2, "ADDRESS : $address :" ) ;

        In most cases, this is fine, but if I get a 'mail from' of
<domain.only>, my self logging shows a null string.

        What can I do to get the same address that qpsmtpd shows in the
log file with "from email address :" - and why is there a difference? I'm
try to detect that the address was not valid. Is null string the same as
null sender?

        Thanks.