I've started using more of Gmail's features to help control this.
First, there is the actual email address itself: Gmail ignores periods and anything after a + (plus sign). So every new site I sign up for gets a different email address, usually my normal email plus a postfix named after that particular site. This way, when I get emails from recruiters saying they found me through LinkedIn, but are actually using a form of my email address I've only used on Github, I know immediately what is going on.
And second, I just mark them as spam. Because they are.
First, there is the actual email address itself: Gmail ignores periods and anything after a + (plus sign). So every new site I sign up for gets a different email address, usually my normal email plus a postfix named after that particular site. This way, when I get emails from recruiters saying they found me through LinkedIn, but are actually using a form of my email address I've only used on Github, I know immediately what is going on.
And second, I just mark them as spam. Because they are.