I have the same issue. I started saving my email invitations to a folder and discovered that most, if not all, of the ones I'm not getting credited for are SI Daily, I think that's the name- some are Daily2's. I emailed mypoints last week and never got any answer, not even a generic "we've received it and are looking into it" reply. I'll email again tomorrow, but I'm hoping that the mypoints person who's replied on this thread sees this because it's getting VERY frustrating! Not blaming mypoints, I think the problem is with the survey provider, but an answer from mypoints would be nice!