After doing this for nearly 20 years I can say I’ve been pleasantly surprised at how rare it is to get spam unrelated to the company I gave my address to. What

After doing this for nearly 20 years I can say I’ve been pleasantly surprised at how rare it is to get spam unrelated to the company I gave my address to. What it’s been very useful for, in the other hand, is filtering email from companies that don’t honor their unsubscribe links or unchecking their “please send me marketing emails” boxes during signup. The common pattern is for them to invent a new kind of junk mail category and then act as though your opt-out obviously doesn’t apply to this totally new category.