I have problem when I'm sending mails to some recipients outside my organization, recieving mail message from my exchange saying that :
Delivery has failed to these recipients or distribution lists:
An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.
The following organization rejected your message: Postini.
what is the probme exactly.
I sent mail to my domain from x.com domain for test and I'm allready receiving it But when I'm going to reply from Y.com domain to x.com domain again I recieve the error message above.