我们使用SpringJavaMailSenderImpl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>
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
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$1.run(Mailer.java:52)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$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
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，它们可以使用相同的配置完美地发送电子邮件。这里可能有什么问题？
<prop key="mail.smtp.starttls.enable">${mail.smtp.starttls.enable}</prop>
<prop key="mail.smtp.ssl.enable">true</prop>
您希望mail.smtp.ssl.enable直接用于TCP连接后的隐式SSL（端口465），或者mail.smtp.starttls.enable使用STARTTLS命令（端口25）用于显式SSL。但对于您当前的属性，您将两者都设置为true。
这意味着它将通过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。这样你就得到了
无法识别的SSL消息，明文连接？
要修复此问题，请确保使用隐式或显式SSL，但不能同时使用这两种SSL，这取决于端口，即对于端口25，mail.smtp.ssl.enable应为false。
问题发生在javax.mail 1.4.0中，升级到1.4.7修复了我的中的问题
我尝试了很多方法来解决这个问题，但最终发现自己能解决这个问题。
-
在创建代码之前，请确保您能够从终端或任何其他邮件客户端发送电子邮件。一旦您测试过的邮件运行良好，请使用以下属性和代码。我已经在电子邮件服务器中部署了代码，所以我不需要SSL或TLS。我正在使用中继端口25。
-
所需属性-
mail.smtp.host=<myhostname.com> mail.smtp.port=25 mail.smtp.auth=true mail.transport.protocol=smtp smtpd_recipient_restrictions=permit_sasl_authenticated user=<sender_username/email> password=<password> mail.smtp.username=<sender_username/email> mail.smtp.password=<password> -
所需代码-
public String sendEmail(String email){ //Compose the message try { FileReader reader=new FileReader("smtp.properties"); //Get the session object Properties props = new Properties(); props.load(reader); System.out.println(" Props :: " + props.toString()); String to = email; String host=props.getProperty("mail.smtp.host"); final String user=props.getProperty("user"); final String password=props.getProperty("password"); Session session = Session.getInstance(props, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(user, password); } }); Message message = new MimeMessage(session); message.setFrom(new InternetAddress(user)); message.setRecipients( Message.RecipientType.TO, InternetAddress.parse(to) ); message.setSubject("Testing - SMTP"); message.setText("Dear User, nn Hello !"); Transport.send(message); System.out.println("Done"); } catch (MessagingException e) { e.printStackTrace(); } catch (IOException ex) { ex.printStackTrace(); } return "SUCCESS"; } -
所需进口-
import javax.mail.*; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import java.util.Properties;