On my computer that list would have thousands or even tens of thousands of entries and that could easily result in blocking email I want.
Well I was talking about messages that come from easily blocked sources. And many are.
In spite of their best efforts I still get a lot of spam and viruses that at least spoof AOL addresses, so would I want to block that domain?
Actually if there was one domain that would be good to block, where there are more idiots than any other, that must be it.
But of course you're not going to block a commonly used domain. I'm talking about reducing spam - not hoping to eliminate it.
The number of subject lines used in spam and viruses is virtually infinite so that doesn't help all that much either.
I don't understand "subject lines". Yes they can constantly modify their return address but if they don't you've deleted them. And many don't. Also, if they have all their messages coming from a .ssfes.com domain its probably pretty safe to block that domain. And if you're REALLY lucky, your mother inlaw will have picked that one as well due to their free offers which attracted the spammers and her in the first place.
It all sounds so simple, but it isn't. I have found Mails filter to be reasonably effective, but every time it learns a new pattern, the spammers figure a way around it. For example most of the viagra spam these days has a nonsense sender that is a one time throw away domain, a subject line devoid of vowels so there are no words to be recognized and the body of the message is HTML that downloads a graphic so there is no recognizable pattern there either.
Reduction - not elimination. I used to get over a hundred spam a day in my Yahoo box. Now I get only a couple. I can manage a couple. 100 I cannot manage.