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By default FreeBSD uses sendmail which is configured to only send email from the host it is running on. For example, if a POP server is available, then users will be able to check mail from any where, but they still will not be able to send outgoing emails from outside locations. Typically, a few moments after the attempt, an email will be sent from MAILER-DAEMON with a “5.7 Relaying Denied” error message.
To solve this problem, put your ISP's address in a relay-domains file at: /etc/mail/relay-domains. SSH to the server and run the following command: