Email can bounce for many reasons. I’ll look at several of the most common mail bounce messages, and try to interpret what they really mean.
Once you hit that Send button, you must assume that there is no way to stop your email from being sent … even if it’s to the wrong person.
The first thing to understand is the difference between an online program (such as the Yahoo website) and a program running locally on your computer. Then I can point you in the right direction.