I'm trying to use email sending in jenkins. I leave default values, click on 'Test configuration' button and get error:

Failed to send out e-mail

javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25; nested exception is: java.net.SocketException: Permission denied: connect

at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)

at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)

What I missed? It's not working by default?

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