使用 Commons-Email 向 Gmail 发送电子邮件

Question

Email email = new SimpleEmail();
String authuser = "[email protected]";
String authpwd = "*******";
// Very Important, Don't use email.setAuthentication()
email.setSmtpPort(465);
email.setAuthenticator(new DefaultAuthenticator(authuser, authpwd));
email.setDebug(true); // true if you want to debug
email.setHostName("smtp.gmail.com");

email.getMailSession().getProperties().put("mail.smtp.auth", "true");
email.getMailSession().getProperties().put("mail.debug", "true");
email.getMailSession().getProperties().put("mail.smtp.port", "465");
email.getMailSession().getProperties().put("mail.smtp.socketFactory.port", "465");
email.getMailSession().getProperties().put("mail.smtp.socketFactory.class",   "javax.net.ssl.SSLSocketFactory");
email.getMailSession().getProperties().put("mail.smtp.socketFactory.fallback", "false");
email.getMailSession().getProperties().put("mail.smtp.starttls.enable", "true");
email.setFrom("[email protected]", "SenderName");
email.setSubject("TestMail");
email.setMsg("This is a test mail?");
email.addTo("[email protected]", "ToName");
email.send();

它给出了以下异常

SEVERE: org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.gmail.com:465

Answer 1

Commons Email 用户指南提供了使用 SSL 的 Gmail 示例。

https://commons.apache.org/proper/commons-email/userguide.html

< strong>SSL/TLS（端口 465） -> email.setSSLOnConnect(true);

Email email = new SimpleEmail();
email.setHostName("smtp.gmail.com");
email.setSmtpPort(465);
email.setAuthenticator(new DefaultAuthenticator("username", "password"));
email.setSSLOnConnect(true);
email.setFrom("[email protected]");
email.setSubject("TestMail");
email.setMsg("This is a test mail ... :-)");
email.addTo("[email protected]");
email.send();

STARTTLS（端口 587） -> email.setStartTLSEnabled(true);

Email email = new SimpleEmail();
email.setHostName("smtp.gmail.com");
email.setSmtpPort(587);
email.setAuthenticator(new DefaultAuthenticator("username", "password"));
email.setStartTLSEnabled(true);
email.setFrom("[email protected]");
email.setSubject("TestMail");
email.setMsg("This is a test mail ... :-)");
email.addTo("[email protected]");
email.send();

Answer 2

这对我有用

Email email = new SimpleEmail();
String authuser = "[email protected]";
String authpwd = "xxxx";
email.setSmtpPort(587);
email.setAuthenticator(new DefaultAuthenticator(authuser, authpwd));
email.setDebug(true);
email.setHostName("smtp.gmail.com");
email.getMailSession().getProperties().put("mail.smtps.auth", "true");
email.getMailSession().getProperties().put("mail.debug", "true");
email.getMailSession().getProperties().put("mail.smtps.port", "587");
email.getMailSession().getProperties().put("mail.smtps.socketFactory.port", "587");
email.getMailSession().getProperties().put("mail.smtps.socketFactory.class",   "javax.net.ssl.SSLSocketFactory");
email.getMailSession().getProperties().put("mail.smtps.socketFactory.fallback", "false");
email.getMailSession().getProperties().put("mail.smtp.starttls.enable", "true");
email.setFrom("[email protected]", "SenderName");
email.setSubject("TestMail");
email.setMsg("This is a test mail?");
email.addTo("[email protected]", "ToName");
email.setTLS(true);
email.send();

Answer 3

您不需要 告诉Commons Email 表明您正在发送 TLS 电子邮件：

email.setTLS(true);

在调用 email.send() 之前？

我不确定这是否会解决您的问题，因为我不确定您是否在连接到 smtp.gmail.com:465 或成功发送到它时遇到问题（错误消息/异常是不明确的，因为您已经介绍过了），但据我所知，这绝对是缺少的东西。

Answer 4

如果您想使用 TLS，请使用端口 587 和 starttls：

email.getMailSession().getProperties().put("mail.smtp.starttls.enable", "true");
// or call this:
email.setStartTLSEnabled().
// and set the port to 587
email.setSmtpPort(smtpPort);

如果您想使用端口 465，则不要将此设置为 true，而是调用以下函数：

email.setSSLOnConnect(true);
email.setSslSmptPort("465");
// or can set below but remember it is not "smtps" it is "smtp" and port nmber should be 465.

email.getMailSession().getProperties().put("mail.smtp.port", "465");
email.getMailSession().getProperties().put("mail.smtp.socketFactory.port", "465");
email.getMailSession().getProperties().put("mail.smtp.socketFactory.class",   "javax.net.ssl.SSLSocketFactory");
email.getMailSession().getProperties().put("mail.smtp.socketFactory.fallback", "false");

Answer 5

不要忘记启用 Google 安全性较低的应用访问。