Hello all I have asked this question earlier also but could not get a suitable answer. I repeatedly get the following error messages javax.mail.SendFailedException: Sending failed; nested exception is: javax.mail.SendFailedException: 530 delivery not allowed to non-local re cipient, try authenticating if i use java mail - either with authentication routine active or not.. On the contrary the same mailserver works fine with MS outlook (without supplying any authentication information!). Please help me understand this mystery. Thanks all Sridhar    More>>