TLS is the further development of SSL. To tell JavaMail to issue a STARTTLS command you could set mail.smtp.starttls.enable to true (see: http://javamail.kenai.com/javadocs/com/sun/mail/smtp/package-summary.html) or use an instance of SMTPTransport and call smtpTransport.setStartTLS(true) (see: http://javamail.kenai.com/javadocs/com/sun/mail/smtp/SMTPTransport.html)
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