Nag emails about reviewing a product or service
They never has an unsubscribe, and will send multiple emails to you to do a review (Trustpilot based, usually)
Now I am happy to give a star review, but nope, you have to then write some blurb on the product, and now trustpilot wants you to log in first, before doing this. I can't be arsed, quite frankly, unless I have something to gripe about.
And if you don't do the review, they'll send you another reminder or two a few days later. And as these emails come from the vendor, and not trustpilot themselves, you can simply block the sender.