The author's comments a little confusing. He is saying that with iPhoto 4, APPLE has finally given user's the ability to choose Mail/Entourage/Eudora/AOL when sending photos.
The author then says this HIS PROGRAM will ADDITIONALLY send photos using the following email clients:
Too bad, netscape isn't supported. That is what my pops uses and he is too stubborn to try Mail, Eudora, or Entourage.....because netscape has mail integrated with the browser (UGH!)