So it's respectful to forward someone's entire email verbatim without their permission, to talk about said person behind his back, and to spread a simple email introduction over four time-consuming emails instead of two? But it's NOT respectful to just, like, quickly and painlessly introduce the people and assume if it's unwanted it will be ignored like all unwanted email?
I'm not saying your technique is definitely WRONG, but I am saying you shouldn't assume it's superior.