Java 邮件(问题)

1. A secure connection is requiered(such as ssl).
   问题详情：

javax.mail.AuthenticationFailedException: 530 Error: A secure connection is requiered(such as ssl). More information at http://service.mail.qq.com/cgi-bin/help?id=28

    at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:826)
    at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:761)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:685)
    at javax.mail.Service.connect(Service.java:317)
    at javax.mail.Service.connect(Service.java:176)
    at javax.mail.Service.connect(Service.java:125)
    at javax.mail.Transport.send0(Transport.java:194)
    at javax.mail.Transport.send(Transport.java:124)
    at com.mazaiting.mail.SimpleMailServer.sendTextMail(SimpleMailServer.java:59)
    at com.mazaiting.Client.main(Client.java:22)

原因

QQ邮箱需要证书认证。

解决方法

在源代码中的Properties配置时加入

    try {  
            // 进行证书认证   
            MailSSLSocketFactory sf = new MailSSLSocketFactory();  
            sf.setTrustAllHosts(true);  
            properties.put("mail.smtp.ssl.enable", "true");  
            properties.put("mail.smtp.ssl.socketFactory", sf);  
        } catch (GeneralSecurityException e) {   
            e.printStackTrace();  
        }

1. Could not connect to SMTP host: smtp.qq.com, port: 25
   问题详情：

javax.mail.MessagingException: Could not connect to SMTP host: smtp.qq.com, port: 25;
  nested exception is:
    javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1961)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654)
    at javax.mail.Service.connect(Service.java:317)
    at javax.mail.Service.connect(Service.java:176)
    at javax.mail.Service.connect(Service.java:125)
    at javax.mail.Transport.send0(Transport.java:194)
    at javax.mail.Transport.send(Transport.java:124)
    at com.mazaiting.mail.SimpleMailServer.sendTextMail(SimpleMailServer.java:59)
    at com.mazaiting.Client.main(Client.java:22)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
    at sun.security.ssl.InputRecord.handleUnknownRecord(Unknown Source)
    at sun.security.ssl.InputRecord.read(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:549)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:354)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:237)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1927)

译文:无法连接到SMTP主机：smtp.qq.com，端口：25;

原因分析:

• 邮件服务器地址
• 邮件服务器端口后
• 账号
• 密码,不一定时登录密码可能时授权码
• QQ邮箱过程中出现错误,如果程序之前也可以运行成功的话,可以再次生成授权码,有这个原因的。还是不可以的话就请等一会,服务器也需要时间同步。
  以上前四步骤存在错误,因为不同类型邮箱而不同,所以只要我们根据各个邮箱的规则去写。

QQ邮箱授权码获取链接