That section of code was gleaned from something I typed into an editbox; I used it to send an email to myself, using my own email address in both places.
The .From property is usually used (and is the first property checked) and can contain a list of authors. If you don't fill in the .From property, then the .Send() method checks the .Sender property. (Note that NNTP - newsgroups - don't use the .Sender property at all.) All that being said, however, there is nothing that says you must use your own real email address in that field. Use it as the ReplyTo address you wish people to email you back with when they hit the Reply button.
