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In addition to the e-mail properties that you can configure as described in the product documentation, you can manually add the following properties to the email.properties file:
mail.smtp.socketFactory.port - Specifies the port to connect to when using the specified socket factory. If not set, the default port is used.
mail.smtp.socketFactory.class - If set, specifies the name of a class that implements the javax.net.SocketFactory interface. This class will be used to create SMTP sockets.
mail.smtp.socketFactory.fallback - If set to true, failure to create a socket using the specified socket factory class will cause the socket to be created using the java.net.Socket class. Defaults to true.
The property descriptions above were provided by the JavaMail API documentation web site: http://javamail.kenai.com/nonav/javadocs/com/sun/mail/smtp/package-summary.html.