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What's the error?
Being able to receive but not send is often a relaying problem. Most responsible email servers refuse to send email between two parties both of whom are "outside" its domain. So for example if you have a work email server and you're sending from your home ISP, unless there's an exception on the work email server, it probably won't allow the relay. You'd fix this by finding a way to authenticate yourself to the mail server (if it supports it) or by using a different server (usually the one provided by the ISP you're connected to).
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