When you subscribe to an ezine or newsletter, don't make a summary judgement that you don't want it. Give it a half-dozen or so issues before making up your mind. You may simply get an issue that doesn't appeal to you, but the next might be a winner. Some people go so far as to set up a separate email account just for their personal use, and another for their ezines, which is not a bad idea. But, if you do this, for goodness sake remember which one you used.
Most publishers use list servers for their mailings.
You can't unsubscribe from a publication except from the address that they have on file. If you decide you don't want a particular publication any longer, try to unsubscribe, and if you get a message that you are not on the list, it does little good to rant and rave. If you're not there, you're not there - period. While most publishers don't want people on their list who don't wish to receive it, they have no idea what email address you used when subscribing. Most publishers will make an honest effort to remove you from their list, and threats to report them for spamming, will not help them to remove you.