I have noticed a huge uptick recently in emails (I use Gmail) from legitimate companies telling me the likes of: I registered but never logged in, I still have

I have noticed a huge uptick recently in emails (I use Gmail) from legitimate companies telling me the likes of: I registered but never logged in, I still have something in my cart or "thanks for your feedback - we'll be in touch". I imagine it's spammers trying to screw up the spam filters but since most of them get through (makes sense), having to deal with the 20 or so a day is irritating.