无法使用 Apache Commons 电子邮件通过 gmail 发送电子邮件。答案

【问题标题】：Can not send email through gmail with Apache Commons Email.无法使用 Apache Commons 电子邮件通过 gmail 发送电子邮件。
【发布时间】：2011-10-16 03:57:09
【问题描述】：

无法使用 Apache Commons Email 通过 gmail 发送电子邮件。这是什么问题？

Email email = new SimpleEmail();
        email.setHostName("smtp.gmail.com");
        email.setSmtpPort(587);
        email.setTLS(true);
        email.setAuthenticator(new DefaultAuthenticator("mymail@gmail.com", "mypassword"));
        email.setFrom("mymail@gmail.com");
        email.setSubject("TestMail");
        email.setMsg("This is a test mail ... :-)");
        email.addTo("sendmail@gmail.com");
        email.send();

错误：

Exception in thread "main" org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.gmail.com:587
    at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1242)
    at org.apache.commons.mail.Email.send(Email.java:1267)
    at MailService.sendSimpleMail(MailService.java:51)
    at MailService.main(MailService.java:17)
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 587;
  nested exception is:
    java.net.ConnectException: Connection refused: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1391)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
    at javax.mail.Service.connect(Service.java:310)
    at javax.mail.Service.connect(Service.java:169)
    at javax.mail.Service.connect(Service.java:118)
    at javax.mail.Transport.send0(Transport.java:188)
    at javax.mail.Transport.send(Transport.java:118)
    at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1232)
    ... 3 more
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    at java.net.Socket.connect(Socket.java:519)
    at java.net.Socket.connect(Socket.java:469)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:233)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1359)
    ... 10 more

【问题讨论】：

标签： java email gmail apache-commons-email

【解决方案1】：

有什么问题？

Could not connect to SMTP host

（直接从您似乎忽略的异常输出中复制。）

【讨论】：

【解决方案2】：

请设置 email.setDebug(true); 使用此命令，您可以知道您的确切问题是什么也许你的用户名和密码错误

【讨论】：

【解决方案3】：

如果您使用的是常规 Gmail 帐户或 Google Apps 电子邮件帐户，Gmail 可能会阻止当前域。请确保您有足够的权限从其他应用程序发送邮件。

【讨论】：