May I offer a few more words of advice, SweetiePie? This is a public forum and your ex is able to see everything you post about him. And while his stalking efforts are resulting in a negative response from you, he's still getting a response--one that he's able to read online--and that's better in his mind than no response at all.
The best response is none at all. Not here, not via e-mail, not via phone. Remember what I posted the other day (thanks to Gavin DeBecker): the best way to handle a stalker is make yourself completely unavailable to him. That means don't open his e-mails, don't answer his phone calls, don't post about his efforts on line, don't open his snail mail, etc.
When your ex breaks into 4-5 e-mail accounts and you update us online, you're showing him that 4-5 e-mail breeches get your attention. When he learns via this forum that you're reading his e-mails, he will continue to send them. It tells him he's getting results.
When he no longer can reach you in any shape or form, his efforts will be in vain, and he will tire of the game. But you'll learn that soon now that you've picked up a copy of "The Gift of Fear." Please fast forward and read the chapter on "Intimate Partners" first then go back and read the entire book from beginning to end.