javax.mail.MessagingException: 550 Requested action not taken: NUL characters are not allowed.
  at com.sun.mail.smtp.SMTPTransport.issueCommand (SMTPTransport.java: 879)
  at com.sun.mail.smtp.SMTPTransport.finishData (SMTPTransport.java: 820)
  at com.sun.mail.smtp.SMTPTransport.sendMessage (SMTPTransport.java: 322)
  ...

DEBUG: not loading system providers in <java.home></a>/lib

DEBUG: not loading optional custom providers file: /META-INF/javamail.providers

DEBUG: successfully loaded default providers



DEBUG: Tables of loaded providers

DEBUG: Providers Listed By Class Name: {com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Sun Microsystems, Inc], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Sun Microsystems, Inc]}

DEBUG: Providers Listed By Protocol: {imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Sun Microsystems, Inc], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Sun Microsystems, Inc], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]}

DEBUG: not loading optional address map file: /META-INF/javamail.address.map



DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]

DEBUG SMTP: useEhlo true, useAuth false



DEBUG: SMTPTransport trying to connect to host "nnn.nnn.n.nnn", port nn



DEBUG SMTP RCVD: 220 xxxx.xxxxxxxxxxx.xxx SMTP; Mon, 23 Mar 2009 15:18:57 +0800



DEBUG: SMTPTransport connected to host "nnn.nnn.n.nnn", port: nn



DEBUG SMTP SENT: EHLO xxxxxxxxx

DEBUG SMTP RCVD: 250 xxxx.xxxxxxxxxxx.xxx Hello



DEBUG SMTP: use8bit false

DEBUG SMTP SENT: MAIL FROM:<a href="newmsg.cgi?mbx=Main&to=xxxx@xxxxxxxxxxx.xxx"><xxxx@xxxxxxxxxxx.xxx></a>

DEBUG SMTP RCVD: 250 <a href="newmsg.cgi?mbx=Main&to=xxxx@xxxxxxxxxxx.xxx"><xxxx@xxxxxxxxxxx.xxx></a>... Sender ok



DEBUG SMTP SENT: RCPT TO:<yyyyyyyy@yyyyy.yyy.yy>

DEBUG SMTP RCVD: 250 <yyyyyyyy@yyyyy.yyy.yy>... Recipient ok



Verified Addresses

&nbsp;&nbsp;yyyyyyyy@yyyyy.yyy.yy

DEBUG SMTP SENT: DATA

DEBUG SMTP RCVD: 354 Enter mail, end with "." on a line by itself



DEBUG SMTP SENT:

.

DEBUG SMTP RCVD: 550 Requested action not taken: NUL characters are not allowed.

session.setDebug(true);