javamail 获取邮件的问题

[roemin]

javax.mail.MessagingException: error loading POP3 headers;
nested exception is:
java.io.IOException: Unexpected response: =09=09=09=09 </font></P>
at com.sun.mail.pop3.POP3Message.loadHeaders(POP3Message.java:558)
at com.sun.mail.pop3.POP3Message.getHeader(POP3Message.java:336)
at javax.mail.internet.MimeMessage.getMessageID(MimeMessage.java:1225)
at com.baby.server.MailReceiver.getMessageId(MailReceiver.java:393)
at com.baby.server.MailReceiver.getMessageId(MailReceiver.java:381)
at com.baby.server.MailReceiver.getAllMail(MailReceiver.java:194)
at com.baby.server.MailReceiver.main(MailReceiver.java:866)
Caused by: java.io.IOException: Unexpected response: =09=09=09=09 </font></P>
at com.sun.mail.pop3.Protocol.readResponse(Protocol.java:711)
at com.sun.mail.pop3.Protocol.multilineCommand(Protocol.java:725)
at com.sun.mail.pop3.Protocol.top(Protocol.java:549)
at com.sun.mail.pop3.POP3Message.loadHeaders(POP3Message.java:542)
... 6 more

抓有些邮件的时候就突然报这个错误，而且邮件内容也值获取到一半，就断开了。不知道什么原因？