My Mum can't get Roman Originals to stop sending her emails and she keeps buying things. That's what companies not sticking to the industry Code of Practice rely on. The best sites have the option to have a weekly digest email, a summary of the week's offers.
I stopped all Cotton Traders emails last year and won't use them again after they blocked a review I wrote about some shoes. It was a perfectly polite review saying that although the shoes were nice, I didn't think they were a wider fit like other CT shoes I had. In fact, I'd been away somewhere for the weekend that had a CT shop (not a discount outlet), but it didn't have the shoes I wanted. I did try on another pair from the same range which fitted fine, so I felt confident ordering the ones I wanted online.
I received a snotty email from CT saying my review would not be published (or would be withdrawn, I can't remember now). Apparently I had broken the T&C of their reviews and I should have got in touch with customer services which would have agreed to pay for me to return the shoes. I replied asking exactly what was wrong with my review, but they couldn't/wouldn't tell me, so I still don't know what the problem was with my review.
It's the first time anything like that has happened to me and completely turned me against CT. I'd heard about review fixing/fiddling and you can spot fake reviews on Amazon quite easily. Several reviewers will use the same standard text as if choosing from a selection. Also, a group of reviews will all be dated the same date, or a day or so apart. Often that's down to the individual sellers, but my experience was with a big company. Never again.