I created a Mail Contact in Exchange 2007 server. But when i try to compose and send a email to the mail contact, the recipient mail server rejects the email as "Relay Access Denied", but when I send an email to the recipient's email address, the email gets delivered successfully.
A communication failure occurred during the delivery of this message. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message later, or provide the following diagnostic text to your system administrator.
The following organization rejected your message: VA3EHSMHS031.bigwhale.com.
Sent by Microsoft Exchange Server 2007
Diagnostic information for administrators:
Generating server: pigeon.zentree.lan
VA3EHSMHS031.bigwhale.com #550 5.4.1 Relay Access Denied ##rfc822;firstname.lastname@example.org
Original message headers:
Received: from pigeon.zentree.lan ([::1]) by pigeon.zentree.lan ([::1]) with