I put up with some of these out of political necessity (ie., because I can't tell the sender to go to hell because my job requires that I be at least civil to them).

But that ol' delete gets a workout.

Sometimes, I'll reply if the matter is worth the time. I have one chap who says, "Please commment on this." Then I might, because he is sincere is wanting the know if it is the truth or not and I spend the time and effort to find out.

I never pass them on.