Email to some is simply a way to contact friends and family, and to keep in touch. To others, it is a very important method of communicating with business associates.
Unfortunately, those who send out unsolicited ads have created a problem for both. It seems amount of spam received daily increases geometrically, and try as we might, we just can't keep ahead of game.
Let's talk about some of more serious offenders. We have all received email, and tried to respond, only to have response returned as undeliverable. These people forge an email address, and are basically dishonest. Anyone who does business with their ilk, deserves what they get.
High up on list of "pains in neck" are people who list an auto-responder as their return address, and program it to send out a series of emails on a regular basis. If you reply to them and ask to be removed, you will get at least five or more emails from them over a short period of time. These people are also dishonest as they are trying to sell you something, even though you have asked them to cease and desist.
Another winner in this "hit parade" is "fresh from farm newbie" who harvests (or if they are really dumb buys a list) thousands of names and starts sending out unsolicited email. Thinking they have found keys to vault, they start sending out spam by thousands. They really take offense when their ISP (Internet Service Provider) cancels their account.
And don't you just love "braintrust" who sends out his/her thousands of emails and shows email address of everyone they sent it to. Spammers who may receive their ad have just added another thousand or so names to their list.
Let's look at flip side of this coin. First let's agree that we don't like spam. Some people however, really "flip out" and make it their holy grail to get even. In early days of Internet, one solution was to send back hundreds of copies of a long document hoping to fill their mailboxes. That worked for awhile, but modern email readers let someone preview an email and they quickly delete this "reverse spam".