JavaMail问题：无法向SMTP主机发送命令
我正在尝试做java邮件，我得到一个错误“无法向SMTP主机发送命令”。 任何帮助，将不胜感激。 如有可能，任何未来的问题解决方案。 确切的例外是
javax.mail.MessagingException: Can't send command to SMTP host; nested exception is: java.net.SocketException: Connection closed by remote host at com.sun.mail.smtp.SMTPTransport.sendCommand(SMTPTransport.java:2106) at com.sun.mail.smtp.SMTPTransport.sendCommand(SMTPTransport.java:2093) at com.sun.mail.smtp.SMTPTransport.close(SMTPTransport.java:1184) at javax.mail.Transport.send0(Transport.java:197) at javax.mail.Transport.send(Transport.java:124) at TestEmail.main(TestEmail.java:45) at __SHELL17.run(__SHELL17.java:6) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at bluej.runtime.ExecServer$3.run(ExecServer.java:774) Caused by: java.net.SocketException: Connection closed by remote host at com.sun.net.ssl.internal.ssl.SSLSocketImpl.checkWrite(SSLSocketImpl.java:1186) at com.sun.net.ssl.internal.ssl.AppOutputStream.write(AppOutputStream.java:43) at com.sun.mail.util.TraceOutputStream.write(TraceOutputStream.java:114) at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65) at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123) at com.sun.mail.smtp.SMTPTransport.sendCommand(SMTPTransport.java:2104) ... 11 more 我的代码如下
import java.util.*; import javax.mail.*; import javax.mail.internet.*; import javax.activation.*; // Send a simple, single part, text/plain e-mail public class TestEmail { public static void main(String[] args) { // SUBSTITUTE YOUR EMAIL ADDRESSES HERE!!! String to = "my gmail account whose name i removed for publicity"; String from = "my hotmail account whose name i removed for publicity"; // SUBSTITUTE YOUR ISP'S MAIL SERVER HERE!!! String host = "smtp.live.com"; // Create properties, get Session Properties props = new Properties(); // If using static Transport.send(), // need to specify which host to send it to props.put("mail.smtp.host", host); props.put("mail.smtp.starttls.enable", "true"); // To see what is going on behind the scene props.put("mail.debug", "true"); Session session = Session.getInstance(props); try { // Instantiatee a message Message msg = new MimeMessage(session); //Set message attributes msg.setFrom(new InternetAddress(from)); InternetAddress[] address = {new InternetAddress(to)}; msg.setRecipients(Message.RecipientType.TO, address); msg.setSubject("Test E-Mail through Java"); msg.setSentDate(new Date()); // Set message content msg.setText("This is a test of sending a " + "plain text e-mail through Java.\n" + "Here is line 2."); //Send the message Transport.send(msg); } catch (MessagingException mex) { // Prints all nested (chained) exceptions as well mex.printStackTrace(); } } }
服务器需要STARTTLS。 如果我使用telnet进行手动SMTP会话，这就是我得到的：
220 BLU0-SMTP122.phx.gbl Microsoft ESMTP MAIL Service, Version: 6.0.3790.4675 ready at Mon, 18 Jul 2011 17:08:14 -0700 HELO jhmg.net 250 BLU0-SMTP122.phx.gbl Hello [70.123.155.64] MAIL FROM: 530 5.7.0 Must issue a STARTTLS command first
此服务器不接受未加密的连接
今天我经历了同样的问题。 但对我来说问题是，在smtp服务器TLS没有启用。 所以我改变了这样的邮件属性。
mail.smtp.starttls.enable=false
现在每件事对我都有好处。
尝试从地址添加
mail.setFromAddress（“Name”）;
在我的情况下，我能够在启用邮件程序调试后找到根问题。
启用邮件程序调试的不同方法：
java -Dmail.debug=true ...
props.put("mail.smtp.starttls.enable", "true"); props.put("mail.debug", "true");
Jenkins配置（/ etc / default / jenkins）：
JAVA_ARGS="-Dmail.smtp.starttls.enable=true -Dmail.debug=true"
更多信息： http ： //www.oracle.com/technetwork/java/faq-135477.html
我的特殊错误是，在创建电子邮件时，“from：”行中的地址不正确。 Google“G Suite”（适用于商家的Google应用）要求发件人地址与帐户所有者位于同一个域中。 例如。 mycompanyname.com
邮件调试显示：
MAIL FROM: