java - 如何正确设置 javamail 以使用 STARTTLS？

Question

在设置 session 时，我设置了 starttls.enable 和 .required 属性，但是当连接发生时，根据文档，它应该会失败:

mail.smtp.starttls.enable boolean If true, enables the use of the STARTTLS command (if supported by the server) to switch the connection to a TLS-protected connection before issuing any login commands. Note that an appropriate trust store must configured so that the client will trust the server's certificate. Defaults to false." http://javamail.kenai.com/nonav/javadocs/com/sun/mail/smtp/package-summary.html

props = new Properties();
props.put("mail.smtps.host", MAILSERV);
props.put("mail.smtps.socketFactory.port", 465);
props.put("mail.smtps.auth", "true");
props.put("mail.smtps.port", 465);
props.put("mail.smtps.socketFactory.fallback", "false");
props.put("mail.smtps.socketFactory.class","utils.DummySSLSocketFactory");
props.put("mail.smtps.quitwait", "false");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.starttls.required", "true");
Session session = Session.getInstance(props, authenticator);  


transport = session.getTransport("smtps");
transport.connect(mailServer, port, username, password);
transport.sendMessage(message, message.getAllRecipients());

那么我做错了什么，让我在服务器不支持 Starttls 时使用它？

Answer 1

我在 STARTTLS 方面遇到的问题是由我获得安全传输引起的:

transport = session.getTransport("smtps");

将其更改为“smtp”后，我能够使用 STARTTLS。