I don't want to be rude or mean or anything, but I don't want to keep repeating the same thing over and over :-(
If you think your ISP allow you to use their mail server, you might contact them for help w/ your script. If not succeeded, you should join some forums that discuss more about coding so they can give you a hand to solve your issue
BTW, it seems you got that error because you might need authentication to bypass your isp's mail server; however, this is just a guess, you might contact them to verify; remember, they would immediately terminate your service if they do not allow people to use their mail server :-( You're warned!!!
Have fun,
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