我可以向自己发送邮件（不是通过 intertubes 发送），但似乎无法使用 Java 进行如下复制。Postfix 通过 telnet 表现良好：
thufir@dur:~$
thufir@dur:~$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 dur.bounceme.net ESMTP Postfix (Ubuntu)
helo me
250 dur.bounceme.net
mail from:<someone@somewhere.com>
250 2.1.0 Ok
rcpt to:<thufir@dur.bounceme.net>
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
subject: hmm, is this smtp?
how do I do this from Java?
there's no password...
postfix-dovecot
.
250 2.0.0 Ok: queued as 81A9717FEB0
quit
221 2.0.0 Bye
Connection closed by foreign host.
thufir@dur:~$
这是Java中的堆栈跟踪，我只能看到它，java.net.ConnectException: Connection refused但我不知道为什么：
Feb 23, 2013 3:03:29 AM net.bounceme.dur.nntp.MessageSender send
SEVERE: {0}
javax.mail.MessagingException: Could not connect to SMTP host: dur.bounceme.net, port: 25;
nested exception is:
java.net.ConnectException: Connection refused
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1962)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654)
at javax.mail.Service.connect(Service.java:295)
at net.bounceme.dur.nntp.MessageSender.send(MessageSender.java:57)
at net.bounceme.dur.nntp.MessageSender.populate(MessageSender.java:46)
at net.bounceme.dur.nntp.MessageSender.<init>(MessageSender.java:30)
at net.bounceme.dur.nntp.ArticleReader.<init>(ArticleReader.java:28)
at net.bounceme.dur.nntp.Driver.<init>(Driver.java:13)
at net.bounceme.dur.nntp.Driver.main(Driver.java:17)
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:321)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:237)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1928)
... 8 more
BUILD SUCCESSFUL (total time: 3 seconds)
相关代码：
package net.bounceme.dur.nntp;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class MessageSender {
private final static Logger LOG = Logger.getLogger(MessageSender.class.getName());
private String header;
private String body;
private Properties p;
private Session session;
private MimeMessage message;
private MessageSender() {
}
public MessageSender(Properties p, String... s) throws Exception {
header = s[0];
body = s[1];
this.p = p;
populate();
}
private void populate() throws Exception {
String lines[] = header.split("\\n");
session = Session.getDefaultInstance(p, null);
message = new MimeMessage(session);
LOG.fine("\n\n\n\nnew message************\n\n\n\n");
for (String s : lines) {
message.addHeaderLine(s);
}
message.setContent(message, body);
String recipient = p.getProperty("recipient");
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(recipient));
send();
}
private void send() {
try {
String protocol = p.getProperty("protocol");
String host = p.getProperty("host");
int port = Integer.valueOf(p.getProperty("port"));
String username = p.getProperty("username");
String password = p.getProperty("password");
Transport transport = session.getTransport(protocol);
transport.connect(host, port, username, password);
transport.sendMessage(message, message.getAllRecipients());
} catch (MessagingException ex) {
LOG.log(Level.SEVERE, "{0}", ex);
}
}
}