If you have suggestions for useful tutorials, exercises, or improvements, send them to: addr1.addr2@comcast.net.
Well, the spam programs can send their stuff there. You, being human, (presumably) will extract addr1 and addr2 from the URL of this page. Thus, if the URL were http://home.comcast.net/~first.last/..., you would send your mail to first.last@comcast.net.