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This means it is not supported by the server.
If I see the JavaMail code, the fact that STLS is actually used is controlled by a javamail property 'mail.pop3.starttls.enable', which by default is false. So it must be enabled somewhere, perhaps in a javamail.properties file or an application server configuration file or something. My knowledge of JavaMail is too crude to be able to answer that.
I see, thanks for the help!