无法发送邮件 - javax.net.ssl.SSLException：无法识别的 SSL 消息，纯文本连接？
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Unable to Send Mail - javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
提问by ArunM
We are sending Mail using Spring JavaMailSenderImpl. Following is the configuration
我们使用 Spring JavaMailSenderImpl发送邮件。以下是配置
<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<property name="host" value="${host}"/>
<property name="port" value="${port}"/>
<property name="username" value="${mail.username}"/>
<property name="password" value="${mail.password}"/>
<property name="javaMailProperties">
<props>
<!-- Use SMTP transport protocol -->
<prop key="mail.transport.protocol" >${mail.transport.protocol}</prop>
<!-- Use SMTP-AUTH to authenticate to SMTP server -->
<prop key="mail.smtp.auth">${mail.smtp.auth}</prop>
<!-- Use TLS to encrypt communication with SMTP server -->
<prop key="mail.smtp.starttls.enable">${mail.smtp.starttls.enable}</prop>
<prop key="mail.debug">false</prop>
<prop key="mail.smtp.ssl.enable">true</prop>
</props>
</property>
</bean>
Properties File :-
属性文件：-
host=XXXX.XXXX.XX
port=25
mail.username=xxxxxxxx
mail.password=xxxxxxx
mail.transport.protocol=smtp
mail.smtp.auth=true
mail.smtp.starttls.enable=true
Console Logs
控制台日志
Exception in thread "taskExecutor-2" org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not connect to SMTP host: XXXX.XXXX.XX, port: 25;
nested exception is:
javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?. Failed messages: javax.mail.MessagingException: Could not connect to SMTP host: XXXX.XXXX.XX, port: 25;
nested exception is:
javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?; message exception details (1) are:
Failed message 1:
javax.mail.MessagingException: Could not connect to SMTP host: XXXX.XXXX.XX, port: 25;
nested exception is:
javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
at javax.mail.Service.connect(Service.java:295)
at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:389)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:336)
at com.XXXX.Mailer.run(Mailer.java:52)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at sun.security.ssl.InputRecord.handleUnknownRecord(InputRecord.java:671)
at sun.security.ssl.InputRecord.read(InputRecord.java:504)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:927)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1312)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1339)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1323)
at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:507)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
... 9 more
We are convinced that this is not related to the SSL certificate as there are other web applications deployed in the same server which sends email perfectly with the same configuration. What could be the issue here ?
我们确信这与 SSL 证书无关，因为在同一服务器中部署了其他 Web 应用程序，它们以相同的配置完美地发送电子邮件。这可能是什么问题？
采纳答案by Steffen Ullrich
<prop key="mail.smtp.starttls.enable">${mail.smtp.starttls.enable}</prop>
<prop key="mail.smtp.ssl.enable">true</prop>
You want either mail.smtp.ssl.enablefor implicit SSL directly after TCP connect (port 465) or mail.smtp.starttls.enablefor explicit SSL using the STARTTLS command (port 25). But with your current properties you set both to true.
您需要mail.smtp.ssl.enable在 TCP 连接（端口 465）之后直接使用隐式 SSL，或者mail.smtp.starttls.enable使用 STARTTLS 命令（端口 25）使用显式 SSL。但是使用您当前的属性，您将两者都设置为 true。
This means it will do a TCP connect to port 25 and try a SSL handshake there. This will fail because the server is sending a plain text greeting from the SMTP dialog and not the expected SSL handshake. Thus you get
这意味着它将 TCP 连接到端口 25 并在那里尝试 SSL 握手。这将失败，因为服务器正在从 SMTP 对话框发送纯文本问候语，而不是预期的 SSL 握手。因此你得到
Unrecognized SSL message, plaintext connection?
无法识别的 SSL 消息，纯文本连接？
To fix it make sure that you either use implicit or explicit SSL but not both depending on the port, i.e. for port 25 mail.smtp.ssl.enableshould be false.
要修复它，请确保您使用隐式或显式 SSL，但不能同时使用取决于端口，即端口 25mail.smtp.ssl.enable应为 false。
