my $string = 'to=<adam.clark@ngv.vic.gov.au>, relay=monet1.ngv.vic.gov.au[10.10.10.20]:25, delay=0.54, delays=0.06/0.02/0/0.46, dsn=2.0.0, status=sent ';

$LogLineHash = qr {
        ^
        ([^=]*)=<?(.*?)>?,?\s+)
        (.*?)
        $
}xi;

while ( $string ){
        print "String: $string\n";
        ( $junk , $key , $value, $string  )
                = split( /$LogLineHash/ , $string );

        print "Key: $key\nValue: $value\nLeft Over: $string\n\n";
        $Hash{$key}=$value;
}

while ( my ($key, $value) = each(%Hash) ) {
        print "$key => $value\n";
    }