Javamail SMTP属性协议名称混淆

Question

我无法理解Javamail配置中缺少的内容。我对属性键的“协议”部分感到有点困惑。

这是我的SMTP代码：

public Session getSendSession(){
        Properties props = new Properties();
        String protocol="smtps";
        props.put("mail.host", "smtp.myserver.com");
        props.put("mail.transport.protocol", protocol);
        props.put("mail."+protocol+".port", 587);
        if(protocol!=null && protocol.toLowerCase().endsWith("s")){
            props.put("mail."+protocol+".ssl.enable","true");
            try {
                MailSSLSocketFactory sf = new MailSSLSocketFactory();
                sf.setTrustAllHosts(true);
                props.put("mail."+protocol+".ssl.socketFactory", sf);
            } catch (GeneralSecurityException e) {
                throw new SystemException(e);
            }
            props.put("mail."+protocol+".ssl.trust","*");
        }
        props.put("mail."+protocol+".auth", "true");
        Session mailSession= Session.getInstance(props, 
            new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("test@myserver.com","test");
                }
            });
        mailSession.setDebug(true);
        return mailSession;
    }

这是道具的调试输出：

{mail.smtps.ssl.enable = true，mail.transport.protocol = smtps，mail.smtps.port = 587，mail.smtps.ssl.trust = *，mail.smtps.auth = true，mail.host = smtp .myserver.com，mail.smtps.ssl.socketFactory=com.sun.mail.util.MailSSLSocketFactory@cfa4b2}

通过这种配置，我得到了这个调试输出：

DEBUG: setDebug: JavaMail version 1.4.7
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth false
DEBUG SMTP: trying to connect to host "smtp.myserver.com", port 25, isSSL false

如您所见，ssl和端口配置被忽略！

如果我用简单的“smtp”（没有“s”）更改每个属性的协议部分，则连接成功：

public Session getSendSession(){
    Properties props = new Properties();
    String protocol="smtps";
    props.put("mail.host", "smtp.myserver.com");
    props.put("mail.transport.protocol", protocol);
    props.put("mail.smtp.port", 587);
    if(protocol!=null && protocol.toLowerCase().endsWith("s")){
        props.put("mail.smtp.ssl.enable","true");
        try {
            MailSSLSocketFactory sf = new MailSSLSocketFactory();
            sf.setTrustAllHosts(true);
            props.put("mail.smtp.ssl.socketFactory", sf);
        } catch (GeneralSecurityException e) {
            throw new SystemException(e);
        }
        props.put("mail.smtp.ssl.trust","*");
    }
    props.put("mail.smtp.auth", "true");
    Session mailSession= Session.getInstance(props, 
        new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("test@myserver.com","test");
            }
        });
    mailSession.setDebug(true);
    return mailSession;
}

道具调试：

{mail.smtp.port=587, mail.smtp.ssl.trust=*, mail.transport.protocol=smtps, mail.smtp.auth=true, mail.smtp.ssl.enable=true, mail.host=smtp.myserver.com, mail.smtp.ssl.socketFactory=com.sun.mail.util.MailSSLSocketFactory@45760}

调试输出：

DEBUG: setDebug: JavaMail version 1.4.7
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.myserver.com", port 587, isSSL true

我也查看了javamail源代码，看起来属性是用“mail。”+（协议/名称）+“。value”按预期读取的。我错过了什么？

我错过了什么？