Josh Norton has entered into a period of Silence; it is extremely unlikely that you will receive a reply to an unsolicited message. The one exception is for problems downloading files from the site; a query of this sort will yield you a form-letter listing the most common solutions to such problems.
If you still want to write to him, here's the address: mailto:browe@one.net
For secure communications, add his PGP public key to your keyring and use it to encrypt your message. Remember: if you want any reply to be secure, you must include a copy of your own public key, or have your key registered on a PGP public keyserver under the same email address you are using for your message.
For those wishing to discuss Enochian magick, Josh Norton recommends subscribing to the enochian-l mailing list. You will get a much wider variety of viewpoints there. To subscribe, send a message to majordomo@hollyfeld.org with the body text: subscribe enochian-l