没有 ssl 的 Java 邮件 - PKIX 路径构建失败：

Question

我正在使用 java 邮件通过 smtp 发送电子邮件。下面给出的 smtp 设置：

        Properties props = new Properties();
        Object put = props.put("mail.smtp.host", smtpHost);
        props.put("mail.smtp.user", smtpUser);
        props.put("mail.smtp.auth", true);
        props.put("mail.debug", mailDebug);
        props.put("mail.smtp.port", port);

已通过使用上述详细信息远程登录到我的 smtpHost 验证了 smtp 凭据。但是，当我在 java 邮件中使用上述设置时，出现以下异常。

        250-AUTH PLAIN LOGIN
        250-STARTTLS
        250 HELP
        DEBUG SMTP: Found extension "SIZE", arg "52428800"
        DEBUG SMTP: Found extension "8BITMIME", arg ""
        DEBUG SMTP: Found extension "PIPELINING", arg ""
        DEBUG SMTP: Found extension "AUTH", arg "PLAIN LOGIN"
        DEBUG SMTP: Found extension "STARTTLS", arg ""
        DEBUG SMTP: Found extension "HELP", arg ""
        DEBUG SMTP: Attempt to authenticate
        DEBUG SMTP: check mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM
        DEBUG SMTP: AUTH LOGIN command trace suppressed
        DEBUG SMTP: AUTH LOGIN failed
        Nov 29, 2012 11:54:40 AM com.Test main
        SEVERE: null
        javax.mail.AuthenticationFailedException: 535 Incorrect authentication data

当我添加行时：

        props.put("mail.smtp.starttls.enable", false);

它再次生成相同的身份验证失败异常。

如果我将 ma​​il.smtp.starttls.enable 设置为 true，则身份验证成功，但出现以下异常：

     220 TLS go ahead
     Nov 28, 2012 5:32:36 PM com.Test main
     SEVERE: null
     javax.mail.MessagingException: Could not convert socket to TLS;
     nested exception is:
    javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:1918)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:652)
    at javax.mail.Service.connect(Service.java:317)

在浏览了有关第二个异常的各种论坛主题后，我运行了 InstallCert 程序来获取服务器的自签名证书。 InstallCert 引发以下异常：

            Opening connection to mydomain.com.au:443...
            Starting SSL handshake...
            javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
                    at sun.security.ssl.InputRecord.handleUnknownRecord(InputRecord.java:542)
                    at sun.security.ssl.InputRecord.read(InputRecord.java:374)
                    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:850)
                    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1190)
                    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1217)
                    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1201)
                    at InstallCert.main(InstallCert.java:100)
            Could not obtain server certificate chain

所以，看起来我的服务器没有 ssl，但启用了 starttls。将开启 STARTTLS 的邮件发送到没有 ssl 的服务器的正确参数是什么？

Answer 1

This JavaMail FAQ entry 应该会有所帮助。

尝试像这样使用 MailSSLSocketFactory：

  MailSSLSocketFactory sf = new MailSSLSocketFactory();
  sf.setTrustAllHosts(true);
  props.put("mail.smtp.ssl.socketFactory", sf);

Answer 2

为我工作:)

Properties props = new Properties();
        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.host", "smtp.companydomain.biz"); // 
        props.put("mail.smtp.auth", "true");
        props.put("mail.debug", "true"); 
        props.put("mail.smtp.starttls.enable", "true");`enter code here`
        props.put("mail.smtp.port", "25");
        props.put("mail.smtp.socketFactory.port", "25");
        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.fallback", "true");

        MailSSLSocketFactory sf = null;
        try {
            sf = new MailSSLSocketFactory();
        } catch (GeneralSecurityException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        sf.setTrustAllHosts(true);
        props.put("mail.smtp.ssl.socketFactory", sf);

        Session mailSession = Session.getInstance(props, new javax.mail.Authenticator() {

            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("mail@companydomain.biz", "password");
            }
        });

        mailSession.setDebug(true); // Enable the debug mode

        Message msg = new MimeMessage( mailSession );

        //--[ Set the FROM, TO, DATE and SUBJECT fields
        try {
            msg.setFrom( new InternetAddress( "mail@companydomain.biz" ) );
        } catch (AddressException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            msg.setRecipients( Message.RecipientType.TO,InternetAddress.parse("myemailid@companydomain.biz") );
        } catch (AddressException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //msg.setSentDate(new Date());
        try {
            msg.setSubject( "Hello World!" );
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        //--[ Create the body of the mail
        try {
            msg.setText( "Hello from my first e-mail sent with JavaMail" );
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        //--[ Ask the Transport class to send our mail message
        try {
            Transport.send( msg );
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }   
    }

Answer 3

我在使用 java 8 时遇到了这个问题。更新此属性后问题解决了

props.put("mail.smtp.ssl.trust", "smtp.gmail.com")

if used spring boot in application.property

spring.mail.properties.mail.smtp.ssl.trust = smtp.gmail.com

我认为这会有所帮助。