i have setup the database mail fine and can send database mail. But from SSRS subcription on SQL 2008 sp1. but it sends out failing messge:

Failure sending mail: The server rejected the sender address. The server response was: 550 5.7.1 Client does not have permissions to send as this sender Mail will not be resent.

i have proper email address as well as have set following in config file:

SMTPAuthenticate to 2.
Set SendEmailToUserAlias to False.

Set DefaultHostName to the Domain Name System (DNS) name or IP address of the SMTP server or forwarder.


please help urgent!!