Domain Renewal Group seem to be using the same modus operandi as Domain Registry of America (DROA) – they may even be the same company for all I know!
In any case here’s a sample letter (click to enlarge):
Notice the pricing on a .org domain – €28 per annum!!!! We charge less than €6 at the moment and I honestly can’t understand why anyone would even dream of paying more than €10.
In any case if you get any of these letters I suggest dumping them – I’ve had a nice thick pile of them to date!