Well, sometimes it happens with me, when people spam too much and my mail folder and spam folder fills up with these spams. At that time, it becomes very much difficult to find out our required mail. But there are a lot of people spam on the basis of your phone number, emails, websites, social networks etc. Out of 80% people are victim of this.
I feel your pain. Just remember though that it is technically not spam if you agreed to receive email from them.
You are right, but it is another thing that some websites and projects send only a few good emails and other are promotional emails. You will have to look all the emails to search your desired email, in case you miss that on same day.