I am able to retrieve the attachments from the POP3 server. But before retrieving I would like to compare the size of the attachment with the available disk space which I am not able to do. Thanks in advance. 
  use Carp;
    use Email::MIME;
    use File::Basename;
    use Net::POP3;
        use File::Find;

        my $server         = '192.168.100.254';
    my $receiveruname  = 'admin';
    my $password       = 'admin';
    my $attachment_dir = 'D:\\Attachments\\';

    my $pop = Net::POP3->new($server);
    croak "Couldn't connect to the server.\n\n" unless $pop;
    my $num_messages = $pop->login( $receiveruname, $password );
    croak "Connection trouble network password user ..."
    unless defined $num_messages;

    for my $i ( 1 .. $num_messages ) {

        my $aref = $pop->get($i);
          my $em = Email::MIME->new( join '', @$aref );

          for ( my @parts = $em->parts ) {
                print $_->content_type, "\n";
                next unless $_->content_type =~ m(^application/octet-s
+tream)i;
                my $filename = basename( $_->filename || '' );
                my $basefilename = $filename || 'UNNAMED';

                        my $filesize = -s "$filename" ;
                        print "\nFilesize of $filename = $filesize \n"
+;

                        if ( $filename eq "null" ) {
                                 $pop->delete($i);     # To avoid down
+loading file "null" of 0KB
                        }
                        else {
                                open my $fh, ">", "$attachment_dir/$fi
+lename" or croak $!;
                    binmode $fh;
                    print $fh $_->body;
                            $pop->delete($i);
                        }

          }
    }

    $pop->quit;

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In reply to How to find the size of an attachment in a POP3 server by Satish@Stag

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