Java EE (Java Enterprise Edition) General Discussion

Hi,

I am facing a strange problem. I have set up the Java Mail and when I try to send email emails fail for about *50%* of times with the following error Message:

RCPT TO:<_valid_emailID_mailto:valid_emailID@att.com>
550 5.7.1 ... Relaying denied
DEBUG SMTP: Invalid Addresses
DEBUG SMTP: [mailto:valid_emailID@att.com]
DEBUG SMTP: Sending failed because of invalid destination addresses
RSET
250 2.0.0 Reset state
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
class com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 ... Relaying denied 
at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1130)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:525)
at javax.mail.Transport.send0(Transport.java:151)
at javax.mail.Transport.send(Transport.java:80)

While with the same email ID, mailing server and configuration other emails are going through fine. Can any one please suggest?

Thanks,
Milo.