Spam Filter

About a year ago, I started to set my filter rules in webmail. The spam filter has successfully helped to eliminate over 3000 junk email messages, average 10 spam mesages are caught per day. Still not good enough as I have about 50 junk email a day. I need to make tighter control in filtering.

Increasingly, spammers send out HTML mails with images containing adveritizement to avoid spam messages being filtered by text-based rules. Nothing on Earth can filter this kind of spam mail.

Here is the hit rates of my text-based filtering rules :

No. of hits	String in message header
17	Award
91	Free
36	Application
120	Cheap
138	Free
34	Fw:
27	Fwd:
8	Male
53	N/A
11	Notice
3	ROLEX
284	ci	(target word is cialis)
144	med	(taget word is medicine)
111	online	(target word is online porn)
48	order
51	pharmacy
111	price
24	shop
12	size	(target word is penis size)
60	software
2	strength
99	weight
No. of hits	String in message body
97	Generic
172	cheap
107	cialis
1022	click
3	good price
87	loan
106	mort	(taget word is mortgage)
85	rates
82	unsubscribe
80	viagra