通过JavaMail发送到gmail时出现TLS问题

事实certificate，JavaMail比我想象的更令人沮丧。 我在网上看了几个关于如何通过Gmail服务器发送简单SMTP电子邮件的例子（但不是通过SSL）。 在尝试了几个不同的代码示例之后，当我调用transport.connect()时，我总是得出相同的示例exception。 我不断得到这个堆栈跟踪：

 Exception in thread "main" com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. l10sm302158wfk.21 at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2057) at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1580) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1097) at SendEmail.main(SendEmail.java:47) 

有人可以告诉我应该添加或做什么来解决这个问题？

这是我的代码：

  Properties props = new Properties(); props.put("mail.transport.protocol", "smtp"); props.put("mail.host", "smtp.gmail.com"); props.put("mail.user", "[e-mail]"); props.put("mail.password", "blah"); props.put("mail.port", "587"); Session mailSession = Session.getDefaultInstance(props, null); Transport transport = mailSession.getTransport(); MimeMessage message = new MimeMessage(mailSession); message.setSubject("This is a test"); message.setContent("This is a test", "text/plain"); message.addRecipient(Message.RecipientType.TO, new InternetAddress("[e-mail]")); transport.connect(); transport.sendMessage(message, message.getRecipients(Message.RecipientType.TO)); transport.close(); 

Answer 1

您需要启用STARTTLS 。 在配置中添加一个属性：

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

Answer 2

 import java.util.*; import javax.mail.*; import javax.mail.internet.*; import javax.activation.*; public class CopyOfSendMail { private static String SMPT_HOSTNAME = "my smtp port no"; private static String USERNAME = "root"; private static String PASSWORD = "root"; public static void main(String[] args) { Properties props = new Properties(); props.put("mail.smtp.host", SMPT_HOSTNAME); props.put("mail.from","[e-mail]"); props.put("mail.smtp.starttls.enable", "true"); props.put("mail.smtp.auth", "true"); props.put("mail.debug", "true"); Session session = Session.getInstance(props, new Authenticator() { @Override protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(USERNAME, PASSWORD); } }); try { MimeMessage msg = new MimeMessage(session); msg.setFrom(); msg.setRecipients(Message.RecipientType.TO, "[e-mail]"); msg.setSubject("JavaMail hello world example"); msg.setSentDate(new Date()); msg.setText("Hello, world!\n"); Transport.send(msg); } catch (MessagingException mex) { System.out.println("send failed, exception: " + mex); } } } 

Answer 3

这里使用MSN-SMTP服务的Mail Sender

我的主机是smtp.live.com ，端口是587。

正如Java Mail的官方文档中所述 ，您可以在这里获得有关发送和接收邮件的最佳Java Mail机制的更多信息。

Mail Client的属性是：

  Properties mailProps = new Properties(); mailProps.put("mail.smtp.user",mailID); mailProps.put("mail.smtp.host",host); mailProps.put("mail.smtp.auth", "true"); mailProps.put("mail.smtp.port",port); mailProps.put("mail.smtp.starttls.enable", "true"); Session mailSession = Session.getInstance(mailProps,null); 

发送机制是：

  SMTPTransport t=(SMTPTransport)mailSession.getTransport("smtp"); System.out.println(" Taking protocol! "); t.connect(host, mailID, password); System.out.println(" Connection Successfull! "); t.sendMessage(mimMessage,mimMessage.getAllRecipients()); 

注意：
Code在本地Indian Server上运行良好。 但这并没有在Azur Congo做出回应：两者都是Linux服务器。

错误是：

  com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first 

即使手动设置系统属性：

  java -Dmail.smtp.starttls.enable=true SendAMai 

@Rob Harrop和@Brian的积分也得到了保证

 if you're on Linux ensure that you have libnss3 and openssl installed