Exchange 2010: Reject Email From Non-FQDN Domain

Hi,

I have Exchange Server 2010 Ver 14.0(Build 639.21).

I have always received an email from a local user while the user is never send emails. If using Microsoft Exchange Troubleshooting Assistant, clientip not use the IP server.

How to reject spam emails and reject non fqdn domain?

I dont have antispam server, I only depend on the Exchange antispam.

Please Help Me..

Thanks.

Nugroho Anindyanto