我开发了一个 webmail 来链接 apache james，它可以工作。但是有些用户无法收到来自 james 的电子邮件。我设置mailSession.setDebug(true)和跟踪两个用户的日志（sa 可以接收，另一个不能）。区别如下：
能成功接收邮件的用户（用户sa）：
[2012-11-15 14:24:12] com.csc.mail.jsh.mail.core.ReceiveMail : [INFO ] - trying to receive emails from james server...
C: STAT
S: +OK 2 2584
C: NOOP
S: +OK
C: TOP 1 0
S: +OK Message follows
...
其他用户接收失败（用户 chai）：
[2012-11-15 14:22:01] com.csc.mail.jsh.mail.core.ReceiveMail : [INFO ] - trying to receive emails from james server...
C: STAT
S: -ERR
C: QUIT
S: +OK Apache James POP3 Server signing off.
[2012-11-15 14:22:03] com.csc.mail.jsh.mail.core.ReceiveMail : [ERROR] - Folder open failed：javax.mail.MessagingException: Open failed;
nested exception is:
java.io.IOException: STAT command failed: null
at com.sun.mail.pop3.POP3Folder.open(POP3Folder.java:228)
at com.csc.mail.jsh.mail.core.ReceiveMail.receive(ReceiveMail.java:82)
at com.csc.mail.jsh.mail.core.ReceiveMail.run(ReceiveMail.java:222)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.IOException: STAT command failed: null
at com.sun.mail.pop3.Protocol.stat(Protocol.java:366)
at com.sun.mail.pop3.POP3Folder.open(POP3Folder.java:203)
... 3 more
我的接收代码：
Session mailSession = Session.getInstance(System.getProperties(), null);
mailSession.setDebug(true);
Store store = null;
Folder folder = null; //javax.mail.Folder
try {
store = mailSession.getStore("pop3");
store.connect(Property.getPop3(), userName, password);
logger.info("trying to receive emails from james server...");
folder = store.getFolder("INBOX");
try {
if (!folder.isOpen()) {
folder.open(Folder.READ_WRITE); //the point of throwing the exception
}
} catch (Exception e) {
e.printStackTrace();
}
//receive email from james server.
} catch (Exception e) {
logger.error("Email Receive Error!" + StackTraceStr.st2str(e));
try {
folder.close(true);
} catch (Exception e2) {
}
} finally {
try {
store.close();
} catch (Exception cloex) {
}
}
我在这里发了一个帖子。感谢您的任何帮助！