I would add this wacko's e-mail address to my junk folder so I do not even have to see his mails again.....get a new phone # and forward your old phone to another # with VM or an answering machine, start recording. Go down to the local police department and make a report about this kook, get it on file.
Go out and get a pair of leather driving gloves..(one size too small) this will come into play later.

Now If he shows up at your home and you have to hack his head off with a dull hacksaw blade or something then at least you can go the self defense route OR leave those gloves at the scene and go golf or something. Remember, if the gloves don't fit, you must acquit ! ...