The server responded: 503 valid RCPT command must precede DATA means you must check your email before trying to send mail. The mail server requires authentication, which can be achieved using one of these methods:
1. Pop before smtp -- check your email for new mail before trying to send email. This adds your IP address to a relayhosts file and allows any email to be sent from that IP address for up to 30 minutes. After 30 minutes you have to authenticate again.
2. Configure your email client to authenticate automatically by checking the "my server requires authentication" box in your email configuration. You will be able to send mail without having to "pop" your mail box first.
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