f you aren't able to send email, this usually means one thing: your internet provider is blocking you from using anyone's outgoing mail servers but their own. Many major internet service providers (ISPs) block port 25, the channel used for communication between an email client and an email server, to prevent their internet connection from being used for spam. When an email client that runs on your computer delivers messages, it uses port 25 to transmit data to remote email servers; therefore, if your ISP is blocking the port, your messages will not get through.
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