Enabling SpamAssassin filtering

Adding filter rule to discard messages with subject was added.

X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on 
	gamma.genwebserver.com
X-Spam-Level: *
X-Spam-Status: No, score=1.7 required=5.0 tests=MISSING_HEADERS,
	MISSING_SUBJECT,NO_RECEIVED,NO_RELAYS,TO_CC_NONE autolearn=no 
	version=3.1.0
From: "Spam Assassin" 

Spam Assassin has been enabled on this account